I have a seminar of a 5 minutes on the topic human control of menstrual cycle so provide a important informations

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I now have all the information needed for a complete, well-structured 5-minute seminar. Here is your presentation material:

Human Control of the Menstrual Cycle

5-Minute Seminar Guide

1. Introduction (30 seconds)

The menstrual cycle is one of the most elegant examples of hormonal control in human physiology. It is not just a uterine event - it is a precisely coordinated axis involving four key players: the hypothalamus, anterior pituitary, ovaries, and uterus (endometrium). On average, the cycle spans 28 days, though this varies widely. Day 1 is defined as the first day of menstrual bleeding.

- Berek & Novak's Gynecology, p. 264

2. The Hormonal Axis - Who Controls What? (1 minute)

The control flows in a hierarchy:

Hypothalamus → Anterior Pituitary → Ovaries → Uterus
    GnRH     →    FSH + LH       →  E2 + P4  →  Endometrium

GnRH (Gonadotropin-Releasing Hormone): A decapeptide produced by neurons in the arcuate nucleus of the hypothalamus. Its most important feature: it must be secreted in a pulsatile fashion to work. Continuous GnRH exposure causes receptor downregulation and shuts off gonadotropin release. The pulse frequency determines whether FSH or LH is favored.
FSH (Follicle-Stimulating Hormone): Stimulates follicular growth and estrogen production.
LH (Luteinizing Hormone): Triggers ovulation and forms the corpus luteum.

- Berek & Novak's Gynecology, p. 270; Ganong's Physiology, p. 404

3. Phase 1: Follicular / Proliferative Phase (Days 1-14) (1 minute)

At the start of the cycle, FSH and LH levels are low. The hypothalamus increases GnRH pulses, stimulating FSH rise.
Several primordial follicles begin to grow; by day 6, one dominant follicle is selected based on its ability to secrete estrogen.
The dominant follicle's granulosa cells aromatize androgens (from theca interna cells) into estradiol (E2).
Rising E2 causes the endometrium to proliferate - glands elongate, spiral arteries grow, and the lining thickens from day 5 to day 14.
E2 also makes cervical mucus thin, watery, and elastic ("ferning" pattern) - creating channels for sperm.

- Costanzo Physiology 7e, p. 479; Ganong's Physiology, p. 405

4. The LH Surge and Ovulation (Day ~14) (45 seconds)

This is the most dramatic moment of the cycle. For most of the follicular phase, rising E2 exerts negative feedback on the pituitary. However, when E2 reaches a critical threshold (>200 pg/mL for ~48 hours), the feedback switches to positive - it now amplifies LH secretion rather than suppressing it.

This results in the LH surge: a massive spike in LH that triggers:

Completion of the first meiotic division in the oocyte
Rupture of the dominant follicle
Release of the secondary oocyte (ovulation) - approximately 9 hours after the LH peak

- Ganong's Physiology, p. 404; Harrison's Principles of Internal Medicine 22e

5. Phase 2: Luteal / Secretory Phase (Days 15-28) (1 minute)

After ovulation, the ruptured follicle transforms into the corpus luteum under the influence of LH.
The corpus luteum secretes both estrogen and progesterone.
Progesterone dominates this phase and transforms the endometrium:
- Glands become coiled and tortuous, filling with glycogen
- Stroma becomes edematous
- Spiral arteries elongate and coil
- Cervical mucus becomes thick and non-penetrable (sperm-hostile)
This is ideal preparation for embryo implantation.

If no fertilization occurs: the corpus luteum degenerates on about day 24, progesterone and estrogen fall sharply, and the spiral arteries spasm → endometrium is shed → menstruation begins → the cycle repeats.

If fertilization occurs: hCG from the trophoblast "rescues" the corpus luteum, maintaining progesterone and preventing menstruation.

- Costanzo Physiology 7e, p. 479; Ganong's Physiology, p. 405

6. Feedback Summary - The Control Loop (30 seconds)

Signal	Effect on Pituitary/Hypothalamus
Rising E2 (follicular phase)	Negative feedback → suppresses FSH/LH
High E2 (pre-ovulatory)	Positive feedback → triggers LH surge
Progesterone (luteal phase)	Negative feedback → slows GnRH pulse frequency
Inhibin B (from granulosa)	Specifically suppresses FSH secretion

This dual-feedback mechanism (negative + positive) is what gives the cycle its precise timing.

7. Clinical Relevance (30 seconds - for seminar impact)

Understanding this axis explains several key clinical applications:

Oral contraceptives (combined estrogen + progestin) work by maintaining steady hormone levels that mimic the luteal phase, suppressing GnRH pulses and preventing the LH surge - no surge = no ovulation.
Fertility drugs like clomiphene block estrogen receptors, preventing negative feedback, thereby increasing FSH/LH output and stimulating follicular growth.
GnRH agonists (e.g., leuprolide) given continuously cause downregulation of GnRH receptors, effectively shutting down the entire axis - used in endometriosis and IVF protocols.
Disruption of the pulsatile GnRH pattern (e.g., by stress, weight loss, or excessive exercise) leads to hypothalamic amenorrhea.

Visual Aid

Here is the anatomy of the female reproductive system and ovarian cycle structures:

Female reproductive system and ovarian follicle development - Ganong's Physiology

Quick Reference Cheat Sheet for Your Seminar

Day	Phase	Dominant Hormone	Endometrium	Key Event
1-4	Menstruation	Low E2, Low P4	Shedding	Bleeding
5-13	Proliferative	Rising E2	Thickens	Follicle grows
~14	Ovulation	LH surge	Peak thickness	Egg released
15-28	Secretory	Progesterone	Secretory glands	Corpus luteum active
26-28	Late luteal	E2 + P4 fall	Breakdown	Corpus luteum dies

Sources: Berek & Novak's Gynecology; Costanzo Physiology 7e; Ganong's Review of Medical Physiology 26e; Harrison's Principles of Internal Medicine 22e (2025)

Make pdf of it and flowchart also

Reading File

Running Command

ls /home/daytona/workspace/ 2>/dev/null && echo "---" && mkdir -p /home/daytona/workspace/menstrual-cycle

Writing File

~/menstrual-cycle/create_flowchart.py

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
from matplotlib.patches import FancyBboxPatch, FancyArrowPatch
import matplotlib.patheffects as pe

fig, ax = plt.subplots(1, 1, figsize=(14, 20))
ax.set_xlim(0, 14)
ax.set_ylim(0, 20)
ax.axis('off')
fig.patch.set_facecolor('#F8F4FF')
ax.set_facecolor('#F8F4FF')

# --- Helper functions ---
def draw_box(ax, x, y, w, h, text, facecolor, edgecolor, fontsize=11, bold=False, text_color='white', radius=0.4):
    box = FancyBboxPatch((x - w/2, y - h/2), w, h,
                          boxstyle=f"round,pad=0.1,rounding_size={radius}",
                          linewidth=2, edgecolor=edgecolor, facecolor=facecolor, zorder=3)
    ax.add_patch(box)
    weight = 'bold' if bold else 'normal'
    ax.text(x, y, text, ha='center', va='center', fontsize=fontsize,
            color=text_color, fontweight=weight, zorder=4, wrap=True,
            multialignment='center')

def draw_arrow(ax, x1, y1, x2, y2, color='#444444', label='', label_side='right'):
    ax.annotate('', xy=(x2, y2), xytext=(x1, y1),
                arrowprops=dict(arrowstyle='->', color=color, lw=2.2), zorder=2)
    if label:
        mx = (x1 + x2) / 2
        my = (y1 + y2) / 2
        offset = 0.35 if label_side == 'right' else -0.35
        ax.text(mx + offset, my, label, ha='center', va='center', fontsize=8.5,
                color=color, fontstyle='italic', zorder=5)

def draw_curved_arrow(ax, x1, y1, x2, y2, color, label=''):
    ax.annotate('', xy=(x2, y2), xytext=(x1, y1),
                arrowprops=dict(arrowstyle='->', color=color, lw=2,
                                connectionstyle='arc3,rad=0.35'), zorder=2)
    if label:
        mx = (x1 + x2) / 2 + 0.6
        my = (y1 + y2) / 2
        ax.text(mx, my, label, ha='center', va='center', fontsize=8.5, color=color, fontstyle='italic')

# =====================
# TITLE
# =====================
ax.text(7, 19.3, 'HUMAN CONTROL OF THE MENSTRUAL CYCLE', ha='center', va='center',
        fontsize=16, fontweight='bold', color='#2C0057',
        bbox=dict(boxstyle='round,pad=0.4', facecolor='#D0B3FF', edgecolor='#6A0DAD', linewidth=2))

ax.text(7, 18.6, 'Hypothalamic–Pituitary–Ovarian–Uterine Axis', ha='center', va='center',
        fontsize=12, color='#5A005A', fontstyle='italic')

# =====================
# AXIS BOXES (main vertical flow)
# =====================
# 1. Hypothalamus
draw_box(ax, 7, 17.5, 4.5, 0.9, 'HYPOTHALAMUS\n(Arcuate Nucleus)',
         facecolor='#6A0DAD', edgecolor='#3D007A', fontsize=12, bold=True)

# Arrow down
draw_arrow(ax, 7, 17.05, 7, 16.2, color='#333333', label='GnRH pulses\n(every 60–120 min)', label_side='right')

# 2. Anterior Pituitary
draw_box(ax, 7, 15.8, 4.5, 0.9, 'ANTERIOR PITUITARY\n(Gonadotrophs)',
         facecolor='#0066CC', edgecolor='#003D80', fontsize=12, bold=True)

# Arrow down — splits into FSH and LH
draw_arrow(ax, 7, 15.35, 7, 14.6, color='#333333')
ax.text(7.35, 14.98, 'FSH + LH', ha='left', va='center', fontsize=9, color='#333333', fontstyle='italic')

# 3a. FSH box (left branch)
draw_box(ax, 4.2, 14.1, 3.0, 0.9, 'FSH\n(Follicle-Stimulating\nHormone)',
         facecolor='#0099AA', edgecolor='#006677', fontsize=9.5, bold=True)

# 3b. LH box (right branch)
draw_box(ax, 9.8, 14.1, 3.0, 0.9, 'LH\n(Luteinizing\nHormone)',
         facecolor='#CC5500', edgecolor='#993300', fontsize=9.5, bold=True)

# Branches from pituitary
ax.annotate('', xy=(4.2, 14.55), xytext=(6.5, 15.35),
            arrowprops=dict(arrowstyle='->', color='#0099AA', lw=2), zorder=2)
ax.annotate('', xy=(9.8, 14.55), xytext=(7.5, 15.35),
            arrowprops=dict(arrowstyle='->', color='#CC5500', lw=2), zorder=2)

# =====================
# OVARIAN SECTION
# =====================
ax.text(7, 13.35, '▼  OVARY  ▼', ha='center', va='center', fontsize=11, color='#990066', fontweight='bold')

# FSH → Follicle growth
draw_arrow(ax, 4.2, 13.65, 4.2, 12.8, color='#0099AA', label='Follicle\ngrowth', label_side='right')
draw_box(ax, 4.2, 12.4, 3.4, 0.9, 'FOLLICULAR PHASE\n(Days 1–14)\nDominant follicle grows',
         facecolor='#009966', edgecolor='#005C3D', fontsize=9, bold=False)

# Follicle → Estrogen
draw_arrow(ax, 4.2, 11.95, 4.2, 11.2, color='#CC0066', label='Secretes\nEstradiol (E2)', label_side='right')
draw_box(ax, 4.2, 10.8, 3.2, 0.7, 'Rising ESTROGEN (E2)\n(Granulosa cells aromatize)',
         facecolor='#CC0066', edgecolor='#880044', fontsize=9)

# LH surge box
draw_box(ax, 9.8, 12.4, 3.2, 0.9, 'LH SURGE\n(~Day 14)\nPositive feedback!',
         facecolor='#FF6600', edgecolor='#CC3300', fontsize=9, bold=True)
draw_arrow(ax, 9.8, 13.65, 9.8, 12.85, color='#CC5500')

# Estrogen → positive feedback → LH surge
draw_curved_arrow(ax, 5.8, 10.8, 8.5, 12.4, color='#FF0000',
                  label='Positive\nfeedback\n(E2 >200 pg/mL)')

# LH surge → Ovulation
draw_arrow(ax, 9.8, 11.95, 9.8, 11.2, color='#FF6600', label='~9 h after\nLH peak', label_side='right')
draw_box(ax, 9.8, 10.8, 3.2, 0.7, 'OVULATION\n(~Day 14)',
         facecolor='#FF4444', edgecolor='#CC0000', fontsize=10, bold=True)

# Connecting line — both phases lead to central arrow
ax.annotate('', xy=(7, 9.8), xytext=(4.2, 10.45),
            arrowprops=dict(arrowstyle='->', color='#555555', lw=1.8), zorder=2)
ax.annotate('', xy=(7, 9.8), xytext=(9.8, 10.45),
            arrowprops=dict(arrowstyle='->', color='#555555', lw=1.8), zorder=2)

# Corpus Luteum
draw_box(ax, 7, 9.4, 4.2, 0.7, 'CORPUS LUTEUM forms\n(LH-dependent)',
         facecolor='#8B4513', edgecolor='#5C2A00', fontsize=9.5, bold=True)

draw_arrow(ax, 7, 9.05, 7, 8.3, color='#333333', label='Secretes E2\n+ Progesterone', label_side='right')

# =====================
# LUTEAL PHASE
# =====================
draw_box(ax, 7, 7.9, 4.5, 0.9, 'LUTEAL PHASE (Days 15–28)\nProgesterone dominates',
         facecolor='#6B4FA0', edgecolor='#3D2070', fontsize=9.5, bold=True)

# Negative feedback arrow (curved, back to pituitary)
draw_curved_arrow(ax, 9.2, 7.9, 10.5, 15.35, color='#AA0000',
                  label='Negative\nfeedback\n(P4 + E2)')

# =====================
# UTERINE CYCLE
# =====================
ax.text(7, 7.1, '▼  UTERUS (ENDOMETRIUM)  ▼', ha='center', va='center',
        fontsize=10.5, color='#660033', fontweight='bold')

# Two uterine outcomes
draw_box(ax, 3.5, 6.1, 3.8, 0.9, 'PROLIFERATIVE\n(Days 5–14)\nE2: Endometrium thickens',
         facecolor='#009966', edgecolor='#005C3D', fontsize=9)

draw_box(ax, 10.5, 6.1, 3.8, 0.9, 'SECRETORY\n(Days 15–28)\nP4: Glands tortuous, edema',
         facecolor='#6B4FA0', edgecolor='#3D2070', fontsize=9)

ax.annotate('', xy=(3.5, 6.55), xytext=(5.5, 7.45),
            arrowprops=dict(arrowstyle='->', color='#009966', lw=1.8))
ax.annotate('', xy=(10.5, 6.55), xytext=(8.5, 7.45),
            arrowprops=dict(arrowstyle='->', color='#6B4FA0', lw=1.8))

# =====================
# TWO OUTCOMES
# =====================
ax.text(7, 5.3, 'If no fertilization:', ha='center', va='center', fontsize=10, color='#333333', fontstyle='italic')

draw_box(ax, 3.5, 4.5, 3.8, 0.9, 'Corpus luteum degenerates\n→ E2 & P4 fall sharply',
         facecolor='#888888', edgecolor='#444444', fontsize=9)
draw_box(ax, 10.5, 4.5, 3.8, 0.9, 'Spiral arteries spasm\n→ MENSTRUATION (Day 1)',
         facecolor='#CC0033', edgecolor='#880022', fontsize=9)

ax.annotate('', xy=(3.5, 4.95), xytext=(3.5, 5.65),
            arrowprops=dict(arrowstyle='->', color='#888888', lw=1.8))
draw_arrow(ax, 5.4, 4.5, 8.6, 4.5, color='#CC0033')

# If fertilization
ax.text(7, 3.7, 'If fertilization occurs:', ha='center', va='center', fontsize=10, color='#006633', fontstyle='italic')
draw_box(ax, 7, 3.1, 5.5, 0.9,
         'Embryo → hCG rescues corpus luteum\n→ Progesterone maintained → No menstruation',
         facecolor='#006633', edgecolor='#004422', fontsize=9)

# Cycle repeats arrow
ax.annotate('', xy=(0.8, 17.5), xytext=(0.8, 4.5),
            arrowprops=dict(arrowstyle='->', color='#999999', lw=2,
                            connectionstyle='arc3,rad=0'), zorder=1)
ax.plot([0.8, 2.5], [4.5, 4.5], color='#999999', lw=2, zorder=1)
ax.plot([0.8, 2.5], [17.5, 17.5], color='#999999', lw=2, zorder=1)
ax.text(0.35, 11, 'CYCLE\nREPEATS', ha='center', va='center', fontsize=8, color='#999999',
        fontweight='bold', rotation=90)

# =====================
# LEGEND
# =====================
legend_y = 2.4
ax.text(7, legend_y, 'KEY:  Red arrows = Positive feedback  |  Dark red curved = Negative feedback  |  Phases: Follicular (green) · Luteal (purple)',
        ha='center', va='center', fontsize=8, color='#444444',
        bbox=dict(boxstyle='round,pad=0.3', facecolor='#EEE8FF', edgecolor='#AAAACC', lw=1))

# Day ruler at bottom
days = [1, 5, 14, 15, 24, 28]
labels = ['Day 1\nMenses\nbegins', 'Day 5\nEndometrium\nregrows', 'Day 14\nOvulation\n(LH surge)',
          'Day 15\nLuteal\nphase', 'Day 24\nCorpus\nluteum dies', 'Day 28\nNext\ncycle']
ax.text(7, 1.9, 'TIMELINE (28-day cycle)', ha='center', fontsize=9, fontweight='bold', color='#333333')
for i, (d, lbl) in enumerate(zip(days, labels)):
    xp = 1.5 + i * 2.05
    ax.plot(xp, 1.5, 'o', markersize=10, color='#6A0DAD', zorder=5)
    ax.text(xp, 1.5, str(d), ha='center', va='center', fontsize=7, color='white', fontweight='bold', zorder=6)
    ax.text(xp, 0.8, lbl, ha='center', va='center', fontsize=6.5, color='#333333')
# connect dots
xs = [1.5 + i*2.05 for i in range(6)]
ax.plot(xs, [1.5]*6, '-', color='#AAAAAA', lw=1.5, zorder=2)

plt.tight_layout(pad=0.5)
plt.savefig('/home/daytona/workspace/menstrual-cycle/flowchart.png', dpi=180, bbox_inches='tight',
            facecolor='#F8F4FF')
print("Flowchart saved!")

Running Command

cd /home/daytona/workspace/menstrual-cycle && python create_flowchart.py 2>&1

Writing File

~/menstrual-cycle/create_pdf.py

from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm, mm
from reportlab.platypus import (SimpleDocTemplate, Paragraph, Spacer, Table,
                                 TableStyle, Image, HRFlowable, PageBreak, KeepTogether)
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY
from reportlab.platypus.flowables import HRFlowable
import os

OUTPUT = '/home/daytona/workspace/menstrual-cycle/Menstrual_Cycle_Seminar.pdf'
FLOWCHART = '/home/daytona/workspace/menstrual-cycle/flowchart.png'

# ─── Colors ───
PURPLE_DARK  = colors.HexColor('#2C0057')
PURPLE_MED   = colors.HexColor('#6A0DAD')
PURPLE_LIGHT = colors.HexColor('#EEE8FF')
BLUE         = colors.HexColor('#0066CC')
TEAL         = colors.HexColor('#0099AA')
GREEN        = colors.HexColor('#009966')
ORANGE       = colors.HexColor('#CC5500')
CRIMSON      = colors.HexColor('#CC0033')
BROWN        = colors.HexColor('#8B4513')
GREY_LIGHT   = colors.HexColor('#F5F5F5')
GREY_MED     = colors.HexColor('#DDDDDD')
WHITE        = colors.white

doc = SimpleDocTemplate(
    OUTPUT,
    pagesize=A4,
    rightMargin=2*cm, leftMargin=2*cm,
    topMargin=2*cm, bottomMargin=2*cm,
    title='Human Control of the Menstrual Cycle',
    author='Seminar Notes'
)

W, H = A4
styles = getSampleStyleSheet()

# ─── Custom Styles ───
def S(name, **kw):
    base = kw.pop('parent', 'Normal')
    s = ParagraphStyle(name, parent=styles[base], **kw)
    return s

title_style    = S('MyTitle',    parent='Title', fontSize=22, textColor=PURPLE_DARK,
                   alignment=TA_CENTER, spaceAfter=4, leading=28, fontName='Helvetica-Bold')
subtitle_style = S('MySubtitle', fontSize=13, textColor=PURPLE_MED,
                   alignment=TA_CENTER, spaceAfter=8, fontName='Helvetica-Oblique')
h1_style       = S('H1', fontSize=14, textColor=WHITE, fontName='Helvetica-Bold',
                   backColor=PURPLE_MED, borderPad=6, leading=18,
                   spaceAfter=6, spaceBefore=14, alignment=TA_LEFT)
h2_style       = S('H2', fontSize=12, textColor=PURPLE_DARK, fontName='Helvetica-Bold',
                   spaceBefore=8, spaceAfter=4, borderLeftPadding=6,
                   borderLeftColor=PURPLE_MED, borderLeftWidth=3)
body_style     = S('Body', fontSize=10.5, textColor=colors.HexColor('#222222'),
                   leading=15, spaceAfter=4, alignment=TA_JUSTIFY)
bullet_style   = S('Bullet', fontSize=10.5, textColor=colors.HexColor('#222222'),
                   leading=14, spaceAfter=3, leftIndent=16, firstLineIndent=-10)
note_style     = S('Note', fontSize=9, textColor=colors.HexColor('#555555'),
                   fontName='Helvetica-Oblique', alignment=TA_CENTER, spaceAfter=6)
tag_style      = S('Tag', fontSize=9.5, textColor=WHITE, fontName='Helvetica-Bold',
                   alignment=TA_CENTER, backColor=PURPLE_MED, borderPad=4)

def section_header(text, color=PURPLE_MED):
    return Table(
        [[Paragraph(text, S('sh', fontSize=13, textColor=WHITE, fontName='Helvetica-Bold',
                             alignment=TA_LEFT, leading=18))]],
        colWidths=[W - 4*cm],
        style=TableStyle([
            ('BACKGROUND', (0,0), (-1,-1), color),
            ('ROUNDEDCORNERS', [6]),
            ('TOPPADDING', (0,0), (-1,-1), 7),
            ('BOTTOMPADDING', (0,0), (-1,-1), 7),
            ('LEFTPADDING', (0,0), (-1,-1), 12),
        ])
    )

def info_box(text, bg=PURPLE_LIGHT, border=PURPLE_MED):
    return Table(
        [[Paragraph(text, S('ib', fontSize=10.5, textColor=PURPLE_DARK,
                             leading=15, alignment=TA_LEFT))]],
        colWidths=[W - 4*cm],
        style=TableStyle([
            ('BACKGROUND', (0,0), (-1,-1), bg),
            ('BOX', (0,0), (-1,-1), 1.5, border),
            ('TOPPADDING', (0,0), (-1,-1), 8),
            ('BOTTOMPADDING', (0,0), (-1,-1), 8),
            ('LEFTPADDING', (0,0), (-1,-1), 12),
            ('RIGHTPADDING', (0,0), (-1,-1), 12),
        ])
    )

def bullet(text, color=PURPLE_MED):
    return Paragraph(f'<font color="#{color.hexval()[2:]}">&#9679;</font>  {text}', bullet_style)

story = []

# ═══════════════════════════════════════════════
#  PAGE 1 — TITLE + INTRO + AXIS
# ═══════════════════════════════════════════════

# Title block
story.append(Spacer(1, 0.3*cm))
title_tbl = Table(
    [[Paragraph('HUMAN CONTROL OF THE<br/>MENSTRUAL CYCLE', title_style)]],
    colWidths=[W - 4*cm],
    style=TableStyle([
        ('BACKGROUND', (0,0), (-1,-1), colors.HexColor('#D0B3FF')),
        ('BOX', (0,0), (-1,-1), 2, PURPLE_DARK),
        ('TOPPADDING', (0,0), (-1,-1), 16),
        ('BOTTOMPADDING', (0,0), (-1,-1), 16),
        ('LEFTPADDING', (0,0), (-1,-1), 16),
        ('RIGHTPADDING', (0,0), (-1,-1), 16),
    ])
)
story.append(title_tbl)
story.append(Spacer(1, 0.15*cm))
story.append(Paragraph('5-Minute Seminar Notes  |  Human Physiology', subtitle_style))
story.append(Paragraph('Sources: Costanzo Physiology 7e · Ganong\'s Physiology 26e · Berek & Novak\'s Gynecology · Harrison\'s 22e (2025)', note_style))
story.append(HRFlowable(width='100%', thickness=1.5, color=PURPLE_MED, spaceAfter=10))

# 1. INTRODUCTION
story.append(section_header('1.  INTRODUCTION'))
story.append(Spacer(1, 0.2*cm))
story.append(Paragraph(
    'The menstrual cycle is a precisely coordinated hormonal axis involving four key '
    'structures: the <b>hypothalamus, anterior pituitary, ovaries,</b> and <b>uterus (endometrium)</b>. '
    'Its primary purpose is to prepare the female reproductive system for fertilization and pregnancy each month. '
    'On average the cycle spans <b>28 days</b>, though 21–35 days is considered normal. '
    '<b>Day 1</b> is defined as the first day of menstrual bleeding.', body_style))
story.append(Spacer(1, 0.2*cm))
story.append(info_box(
    '<b>The 4-component axis:</b>  Hypothalamus (GnRH) → Anterior Pituitary (FSH + LH) '
    '→ Ovaries (Estrogen + Progesterone) → Uterus (Endometrium cyclically prepared)',
    bg=colors.HexColor('#EEE8FF'), border=PURPLE_MED
))
story.append(Spacer(1, 0.3*cm))

# 2. HORMONAL AXIS
story.append(section_header('2.  THE HORMONAL AXIS — WHO CONTROLS WHAT?', color=BLUE))
story.append(Spacer(1, 0.2*cm))

hormones_data = [
    [Paragraph('<b>Hormone</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Source</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Key Role</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER))],
    [Paragraph('<b>GnRH</b>', S('tc', fontSize=10, fontName='Helvetica-Bold', textColor=PURPLE_DARK)),
     Paragraph('Hypothalamus (arcuate nucleus)', S('tc', fontSize=9.5)),
     Paragraph('Pulsatile stimulation of FSH & LH; must be pulsatile to work', S('tc', fontSize=9.5))],
    [Paragraph('<b>FSH</b>', S('tc', fontSize=10, fontName='Helvetica-Bold', textColor=BLUE)),
     Paragraph('Anterior pituitary (gonadotrophs)', S('tc', fontSize=9.5)),
     Paragraph('Follicle growth; stimulates estrogen production by granulosa cells', S('tc', fontSize=9.5))],
    [Paragraph('<b>LH</b>', S('tc', fontSize=10, fontName='Helvetica-Bold', textColor=ORANGE)),
     Paragraph('Anterior pituitary (gonadotrophs)', S('tc', fontSize=9.5)),
     Paragraph('Triggers ovulation (LH surge); forms & maintains corpus luteum', S('tc', fontSize=9.5))],
    [Paragraph('<b>Estradiol (E2)</b>', S('tc', fontSize=10, fontName='Helvetica-Bold', textColor=CRIMSON)),
     Paragraph('Granulosa cells (ovary)', S('tc', fontSize=9.5)),
     Paragraph('Endometrial proliferation; cervical mucus thinning; positive feedback for LH surge', S('tc', fontSize=9.5))],
    [Paragraph('<b>Progesterone (P4)</b>', S('tc', fontSize=10, fontName='Helvetica-Bold', textColor=BROWN)),
     Paragraph('Corpus luteum (ovary)', S('tc', fontSize=9.5)),
     Paragraph('Secretory endometrium; negative feedback on GnRH/LH; thickens cervical mucus', S('tc', fontSize=9.5))],
    [Paragraph('<b>Inhibin B</b>', S('tc', fontSize=10, fontName='Helvetica-Bold', textColor=TEAL)),
     Paragraph('Granulosa cells (ovary)', S('tc', fontSize=9.5)),
     Paragraph('Selectively suppresses FSH secretion', S('tc', fontSize=9.5))],
]
hormone_tbl = Table(hormones_data, colWidths=[3.5*cm, 4.5*cm, 8.3*cm])
hormone_tbl.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), BLUE),
    ('BACKGROUND', (0,1), (-1,1), colors.HexColor('#EDF5FF')),
    ('BACKGROUND', (0,2), (-1,2), GREY_LIGHT),
    ('BACKGROUND', (0,3), (-1,3), colors.HexColor('#EDF5FF')),
    ('BACKGROUND', (0,4), (-1,4), GREY_LIGHT),
    ('BACKGROUND', (0,5), (-1,5), colors.HexColor('#EDF5FF')),
    ('BACKGROUND', (0,6), (-1,6), GREY_LIGHT),
    ('BOX', (0,0), (-1,-1), 1.2, BLUE),
    ('INNERGRID', (0,0), (-1,-1), 0.5, GREY_MED),
    ('TOPPADDING', (0,0), (-1,-1), 6),
    ('BOTTOMPADDING', (0,0), (-1,-1), 6),
    ('LEFTPADDING', (0,0), (-1,-1), 8),
    ('RIGHTPADDING', (0,0), (-1,-1), 8),
    ('VALIGN', (0,0), (-1,-1), 'MIDDLE'),
]))
story.append(hormone_tbl)
story.append(Spacer(1, 0.3*cm))

# ═══════════════════════════════════════════════
#  PAGE 2 — PHASES
# ═══════════════════════════════════════════════
story.append(PageBreak())

story.append(section_header('3.  PHASE 1 — FOLLICULAR / PROLIFERATIVE PHASE  (Days 1–14)', color=GREEN))
story.append(Spacer(1, 0.15*cm))
story.append(bullet('Low FSH & LH at start; hypothalamus increases GnRH pulse frequency → FSH rises.'))
story.append(bullet('Several primordial follicles begin growth; by day 6, <b>one dominant follicle</b> is selected '
                    'based on its superior estrogen-secreting capacity.'))
story.append(bullet('<b>Two-cell, two-gonadotropin model:</b> Theca interna cells (LH-driven) produce androgens → '
                    'aromatized to <b>estradiol</b> by granulosa cells (FSH-driven).'))
story.append(bullet('Rising <b>estradiol</b> causes endometrial <b>proliferation</b> (Days 5–14): glands elongate, '
                    'spiral arteries grow, lining thickens.'))
story.append(bullet('Estradiol makes cervical mucus <b>thin, watery, elastic</b> — the "ferning" pattern — '
                    'creating channels for sperm.'))
story.append(bullet('For most of this phase, rising E2 exerts <b>negative feedback</b> on the pituitary.'))
story.append(Spacer(1, 0.25*cm))

story.append(section_header('4.  THE LH SURGE AND OVULATION  (~Day 14)', color=colors.HexColor('#CC5500')))
story.append(Spacer(1, 0.15*cm))
story.append(info_box(
    '<b>Key concept — Switch from negative to positive feedback:</b><br/>'
    'When E2 exceeds ~200 pg/mL for ≥48 hours, the estrogen feedback switches from '
    'inhibitory to stimulatory. This triggers a massive LH surge from the anterior pituitary.',
    bg=colors.HexColor('#FFF0E0'), border=ORANGE
))
story.append(Spacer(1, 0.15*cm))
story.append(bullet('The LH surge initiates: (1) completion of meiosis I in the oocyte, '
                    '(2) follicle rupture, (3) release of the secondary oocyte.'))
story.append(bullet('<b>Ovulation occurs ~9 hours after the LH peak.</b>'))
story.append(bullet('Minor follicular bleeding into the abdominal cavity can cause brief mid-cycle pain — '
                    'called <b>mittelschmerz</b>.'))
story.append(Spacer(1, 0.25*cm))

story.append(section_header('5.  PHASE 2 — LUTEAL / SECRETORY PHASE  (Days 15–28)', color=colors.HexColor('#6B4FA0')))
story.append(Spacer(1, 0.15*cm))
story.append(bullet('The ruptured follicle transforms into the <b>corpus luteum</b> (LH-dependent), '
                    'which secretes both <b>estrogen and progesterone</b>.'))
story.append(bullet('<b>Progesterone dominates</b> and transforms the endometrium into secretory phase: '
                    'glands become coiled/tortuous, fill with glycogen, stroma becomes edematous, '
                    'spiral arteries elongate and coil.'))
story.append(bullet('Cervical mucus becomes <b>thick and non-penetrable</b> (sperm-hostile) — '
                    'fertilization window has passed.'))
story.append(bullet('Progesterone + E2 exert <b>negative feedback</b> on the hypothalamus and pituitary, '
                    'suppressing further FSH/LH secretion.'))
story.append(Spacer(1, 0.2*cm))

# Two outcomes
outcomes_data = [
    [Paragraph('<b>If NO Fertilization</b>', S('ot', fontSize=11, textColor=WHITE, fontName='Helvetica-Bold', alignment=TA_CENTER)),
     Paragraph('<b>If Fertilization OCCURS</b>', S('ot', fontSize=11, textColor=WHITE, fontName='Helvetica-Bold', alignment=TA_CENTER))],
    [Paragraph('Corpus luteum degenerates (~Day 24)<br/>'
               '→ E2 &amp; P4 fall sharply<br/>'
               '→ Spiral arteries spasm<br/>'
               '→ Endometrium sloughs → <b>Menstruation</b><br/>'
               '→ Cycle repeats from Day 1',
               S('oc', fontSize=10, leading=15, textColor=colors.HexColor('#333333'))),
     Paragraph('Embryo implants → trophoblast secretes <b>hCG</b><br/>'
               '→ hCG rescues the corpus luteum<br/>'
               '→ Progesterone maintained<br/>'
               '→ No menstruation → Pregnancy continues',
               S('oc', fontSize=10, leading=15, textColor=colors.HexColor('#333333')))]
]
outcomes_tbl = Table(outcomes_data, colWidths=[8.15*cm, 8.15*cm])
outcomes_tbl.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (0,0), CRIMSON),
    ('BACKGROUND', (1,0), (1,0), GREEN),
    ('BACKGROUND', (0,1), (0,1), colors.HexColor('#FFF0F0')),
    ('BACKGROUND', (1,1), (1,1), colors.HexColor('#F0FFF5')),
    ('BOX', (0,0), (-1,-1), 1.5, GREY_MED),
    ('INNERGRID', (0,0), (-1,-1), 0.8, GREY_MED),
    ('TOPPADDING', (0,0), (-1,-1), 9),
    ('BOTTOMPADDING', (0,0), (-1,-1), 9),
    ('LEFTPADDING', (0,0), (-1,-1), 10),
    ('RIGHTPADDING', (0,0), (-1,-1), 10),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
]))
story.append(outcomes_tbl)
story.append(Spacer(1, 0.3*cm))

# ═══════════════════════════════════════════════
#  PAGE 3 — FEEDBACK + CLINICAL + TIMELINE TABLE
# ═══════════════════════════════════════════════
story.append(PageBreak())

story.append(section_header('6.  FEEDBACK CONTROL SUMMARY', color=CRIMSON))
story.append(Spacer(1, 0.15*cm))
fb_data = [
    [Paragraph('<b>Signal</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10.5, alignment=TA_CENTER)),
     Paragraph('<b>Type</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10.5, alignment=TA_CENTER)),
     Paragraph('<b>Effect</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10.5, alignment=TA_CENTER))],
    ['Rising E2 (follicular phase)', 'Negative', 'Suppresses FSH & LH → prevents premature LH surge'],
    ['High E2 (>200 pg/mL, ≥48 h)', 'POSITIVE', 'Triggers LH surge → ovulation'],
    ['Progesterone (luteal phase)', 'Negative', 'Slows GnRH pulse frequency → suppresses FSH/LH'],
    ['Inhibin B (granulosa)', 'Negative', 'Selectively suppresses FSH only'],
]
for i in range(1, len(fb_data)):
    for j in range(len(fb_data[i])):
        fb_data[i][j] = Paragraph(fb_data[i][j], S('td', fontSize=10, leading=14))

fb_tbl = Table(fb_data, colWidths=[5.5*cm, 2.8*cm, 8.0*cm])
fb_tbl.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), CRIMSON),
    ('BACKGROUND', (0,2), (-1,2), GREY_LIGHT),
    ('BACKGROUND', (0,4), (-1,4), GREY_LIGHT),
    ('BOX', (0,0), (-1,-1), 1.2, CRIMSON),
    ('INNERGRID', (0,0), (-1,-1), 0.5, GREY_MED),
    ('TOPPADDING', (0,0), (-1,-1), 6),
    ('BOTTOMPADDING', (0,0), (-1,-1), 6),
    ('LEFTPADDING', (0,0), (-1,-1), 8),
    ('VALIGN', (0,0), (-1,-1), 'MIDDLE'),
    ('TEXTCOLOR', (1,2), (1,2), colors.HexColor('#CC0000')),  # POSITIVE in red
]))
story.append(fb_tbl)
story.append(Spacer(1, 0.3*cm))

# 7. CLINICAL APPLICATIONS
story.append(section_header('7.  CLINICAL RELEVANCE', color=TEAL))
story.append(Spacer(1, 0.15*cm))
clin_data = [
    [Paragraph('<b>Application</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Mechanism</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER))],
    [Paragraph('<b>Combined oral contraceptives</b>', S('tc2', fontSize=9.5, fontName='Helvetica-Bold')),
     Paragraph('Steady estrogen + progestin mimic luteal phase → suppress GnRH pulses → no LH surge → no ovulation', S('tc2', fontSize=9.5))],
    [Paragraph('<b>Clomiphene citrate</b>\n(fertility drug)', S('tc2', fontSize=9.5, fontName='Helvetica-Bold')),
     Paragraph('Blocks estrogen receptors in hypothalamus → prevents negative feedback → FSH/LH rise → stimulates follicular growth', S('tc2', fontSize=9.5))],
    [Paragraph('<b>GnRH agonists</b>\n(e.g., leuprolide)', S('tc2', fontSize=9.5, fontName='Helvetica-Bold')),
     Paragraph('Continuous GnRH → receptor downregulation → shuts down entire axis. Used in endometriosis, IVF protocols', S('tc2', fontSize=9.5))],
    [Paragraph('<b>Hypothalamic amenorrhea</b>', S('tc2', fontSize=9.5, fontName='Helvetica-Bold')),
     Paragraph('Stress, extreme weight loss, or over-exercise disrupts pulsatile GnRH → loss of FSH/LH → no ovulation, no periods', S('tc2', fontSize=9.5))],
]
for i in range(1, len(clin_data)):
    for j in range(len(clin_data[i])):
        clin_data[i][j] = Paragraph(str(clin_data[i][j]) if isinstance(clin_data[i][j], str) else clin_data[i][j].text
                                     if hasattr(clin_data[i][j], 'text') else clin_data[i][j],
                                    S('tc2', fontSize=9.5, leading=14))

# rebuild properly
clin_data2 = [
    [Paragraph('<b>Application</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Mechanism</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER))],
    [Paragraph('<b>Combined oral contraceptives</b>', S('tc2', fontSize=9.5, fontName='Helvetica-Bold', textColor=PURPLE_DARK)),
     Paragraph('Steady estrogen + progestin mimic luteal phase → suppress GnRH pulses → no LH surge → no ovulation', S('tc2', fontSize=9.5, leading=14))],
    [Paragraph('<b>Clomiphene citrate</b> (fertility drug)', S('tc2', fontSize=9.5, fontName='Helvetica-Bold', textColor=PURPLE_DARK)),
     Paragraph('Blocks estrogen receptors → prevents negative feedback → FSH/LH rise → stimulates follicular growth', S('tc2', fontSize=9.5, leading=14))],
    [Paragraph('<b>GnRH agonists</b> (leuprolide)', S('tc2', fontSize=9.5, fontName='Helvetica-Bold', textColor=PURPLE_DARK)),
     Paragraph('Continuous GnRH → receptor downregulation → shuts down entire HPO axis. Used in endometriosis, IVF', S('tc2', fontSize=9.5, leading=14))],
    [Paragraph('<b>Hypothalamic amenorrhea</b>', S('tc2', fontSize=9.5, fontName='Helvetica-Bold', textColor=PURPLE_DARK)),
     Paragraph('Stress/weight loss/over-exercise disrupts pulsatile GnRH → no FSH/LH → anovulation + no periods', S('tc2', fontSize=9.5, leading=14))],
]
clin_tbl = Table(clin_data2, colWidths=[5.5*cm, 10.8*cm])
clin_tbl.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), TEAL),
    ('BACKGROUND', (0,1), (-1,1), colors.HexColor('#E8FAFA')),
    ('BACKGROUND', (0,3), (-1,3), colors.HexColor('#E8FAFA')),
    ('BOX', (0,0), (-1,-1), 1.2, TEAL),
    ('INNERGRID', (0,0), (-1,-1), 0.5, GREY_MED),
    ('TOPPADDING', (0,0), (-1,-1), 7),
    ('BOTTOMPADDING', (0,0), (-1,-1), 7),
    ('LEFTPADDING', (0,0), (-1,-1), 8),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
]))
story.append(clin_tbl)
story.append(Spacer(1, 0.3*cm))

# 8. QUICK-REFERENCE TIMELINE TABLE
story.append(section_header('8.  QUICK-REFERENCE TIMELINE TABLE', color=PURPLE_DARK))
story.append(Spacer(1, 0.15*cm))
tl_data = [
    [Paragraph('<b>Days</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Phase</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Dominant Hormone</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Endometrium</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER)),
     Paragraph('<b>Key Event</b>', S('th', textColor=WHITE, fontName='Helvetica-Bold', fontSize=10, alignment=TA_CENTER))],
    ['1–4', 'Menstruation', 'Low E2, Low P4', 'Shedding (stratum functionale)', 'Bleeding; cycle Day 1'],
    ['5–13', 'Proliferative (Follicular)', 'Rising Estradiol', 'Thickens; glands elongate', 'Dominant follicle selected'],
    ['~14', 'Ovulation', 'LH surge', 'Peak thickness', 'Egg released (~9 h after LH peak)'],
    ['15–28', 'Secretory (Luteal)', 'Progesterone + E2', 'Tortuous glands; edematous stroma', 'Corpus luteum active'],
    ['24–28', 'Late Luteal', 'E2 + P4 falling', 'Breakdown of blood supply', 'Corpus luteum degenerates'],
]
row_colors = [
    colors.HexColor('#FFE8E8'), colors.HexColor('#FFF0E8'),
    colors.HexColor('#FFFACC'), colors.HexColor('#E8F5E8'),
    colors.HexColor('#EDE8F5')
]
for i in range(1, len(tl_data)):
    for j in range(len(tl_data[i])):
        tl_data[i][j] = Paragraph(tl_data[i][j], S('td', fontSize=9.5, leading=13))

tl_tbl = Table(tl_data, colWidths=[1.6*cm, 3.8*cm, 3.5*cm, 4.2*cm, 3.2*cm])
ts = TableStyle([
    ('BACKGROUND', (0,0), (-1,0), PURPLE_DARK),
    ('BOX', (0,0), (-1,-1), 1.2, PURPLE_DARK),
    ('INNERGRID', (0,0), (-1,-1), 0.5, GREY_MED),
    ('TOPPADDING', (0,0), (-1,-1), 6),
    ('BOTTOMPADDING', (0,0), (-1,-1), 6),
    ('LEFTPADDING', (0,0), (-1,-1), 7),
    ('VALIGN', (0,0), (-1,-1), 'MIDDLE'),
])
for i, c in enumerate(row_colors):
    ts.add('BACKGROUND', (0, i+1), (-1, i+1), c)
tl_tbl.setStyle(ts)
story.append(tl_tbl)
story.append(Spacer(1, 0.5*cm))

# ═══════════════════════════════════════════════
#  PAGE 4 — FLOWCHART
# ═══════════════════════════════════════════════
story.append(PageBreak())
story.append(section_header('9.  FLOWCHART — Hormonal Control of the Menstrual Cycle', color=PURPLE_DARK))
story.append(Spacer(1, 0.2*cm))

if os.path.exists(FLOWCHART):
    img = Image(FLOWCHART, width=16.5*cm, height=23.5*cm)
    story.append(img)
else:
    story.append(Paragraph('[Flowchart image not found]', body_style))

story.append(Spacer(1, 0.2*cm))
story.append(Paragraph(
    'Figure: Complete hormonal control flowchart of the 28-day menstrual cycle showing the '
    'hypothalamic–pituitary–ovarian axis, feedback mechanisms, endometrial phases, and clinical outcomes.',
    note_style))

# ─── BUILD ───
doc.build(story)
print("PDF created successfully at:", OUTPUT)

Running Command

cd /home/daytona/workspace/menstrual-cycle && python create_pdf.py 2>&1

Running Command

ls -lh /home/daytona/workspace/menstrual-cycle/

Both files are ready. Here are your downloads:

Flowchart (PNG):

flowchart

Image · PNG

Full Seminar PDF (4 pages):

Menstrual Cycle Seminar

PDF Document · PDF

What's included in the PDF:

Page	Content
Page 1	Title + Introduction + Hormone Table (GnRH, FSH, LH, E2, P4, Inhibin B)
Page 2	Follicular Phase → LH Surge → Luteal Phase + Fertilization vs. No Fertilization outcomes
Page 3	Feedback Control Summary Table + Clinical Applications Table + 28-Day Timeline Table
Page 4	Full colour flowchart of the entire hormonal axis

The flowchart shows the complete HPO axis from hypothalamus down to uterus, with:

GnRH pulsatile secretion
FSH + LH branching
Follicular growth → Ovulation → Corpus luteum
Positive and negative feedback arrows
Proliferative and secretory endometrial phases
Day-by-day timeline at the bottom

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