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GNM 1st year 2nd internal exam important diagrams anatomy physiology microbiology

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heart anatomy diagram chambers valves

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neuron structure diagram

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respiratory system lungs anatomy diagram

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kidney nephron structure diagram

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digestive system anatomy diagram stomach intestine

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cell structure organelles diagram

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endocrine system glands hormones diagram

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bacteria cell structure gram staining microbiology

Now I have everything I need. Here is a comprehensive guide to the most exam-important diagrams for GNM 1st Year 2nd Internal Exam, covering all major subjects:

🩺 GNM 1st Year β€” 2nd Internal Exam: Most Important Diagrams

πŸ“Œ ANATOMY & PHYSIOLOGY

1. Structure of the Heart (Chambers, Valves & Blood Flow)

Very high chance β€” asked almost every year
Heart anatomy diagram
Label these parts:
  • 4 chambers: Right atrium, Right ventricle, Left atrium, Left ventricle
  • Valves: Tricuspid, Pulmonary, Mitral (Bicuspid), Aortic
  • Major vessels: Superior/Inferior Vena Cava, Pulmonary artery, Pulmonary veins, Aorta
  • Direction of blood flow (deoxygenated = blue arrows; oxygenated = red arrows)

2. Structure of a Neuron (Nerve Cell)

High chance β€” nervous system chapter
Neuron myelinated vs non-myelinated
Label these parts:
  • Cell body (Soma) with nucleus
  • Dendrites (receive impulses)
  • Axon (carries impulse away)
  • Myelin sheath
  • Node of Ranvier
  • Synaptic terminal (axon end)
  • Differentiate: myelinated vs non-myelinated

3. Nephron β€” Structure of the Kidney's Functional Unit

High chance β€” excretory system
Nephron diagram labeled
Label these parts:
  • Bowman's capsule & Glomerulus (cortex)
  • Proximal convoluted tubule (PCT)
  • Loop of Henle (descending & ascending limb β€” medulla)
  • Distal convoluted tubule (DCT)
  • Collecting duct
  • Blood supply: Afferent arteriole β†’ Glomerulus β†’ Efferent arteriole β†’ Peritubular capillaries

4. Respiratory System / Lungs

Moderate–high chance
Respiratory system anatomy
Label these parts:
  • Nasal cavity β†’ Pharynx β†’ Larynx β†’ Trachea
  • Primary bronchi β†’ Secondary bronchi β†’ Bronchioles
  • Alveoli (air sacs) β€” site of gas exchange
  • Diaphragm
  • Lobes of lungs: Right (3 lobes), Left (2 lobes)
  • Alveolus cross-section showing Oβ‚‚ in / COβ‚‚ out

5. Endocrine System β€” Hypothalamus-Pituitary Axis

Moderate chance β€” endocrine chapter
Hypothalamus pituitary endocrine feedback
Label these:
  • CNS β†’ Hypothalamus β†’ Releasing hormones
  • Anterior Pituitary β†’ Trophic hormones (TSH, ACTH, FSH, LH, GH)
  • Target glands: Thyroid, Adrenal glands, Gonads
  • Negative feedback loop arrows

πŸ“Œ MICROBIOLOGY

6. Bacterial Cell Structure

Very high chance
Draw a bacterial cell showing:
  • Cell wall (Gram +ve = thick peptidoglycan; Gram βˆ’ve = thin peptidoglycan + outer membrane)
  • Cell membrane (plasma membrane)
  • Cytoplasm
  • Nucleoid (circular DNA β€” no true nucleus)
  • Ribosomes (70S)
  • Flagellum, Pili/Fimbriae
  • Capsule (in some)
  • Plasmid

7. Gram Staining β€” Procedure Diagram

High chance β€” asked as flowchart/steps
Draw a flow diagram:
  1. Crystal violet (primary stain) β†’ all cells purple
  2. Gram's iodine (mordant) β†’ fixes stain
  3. Acetone/Alcohol (decolorizer) β†’ Gram +ve stay purple; Gram βˆ’ve lose color
  4. Safranin (counterstain) β†’ Gram βˆ’ve turn pink/red
Result: Gram +ve = Purple/Violet | Gram βˆ’ve = Pink/Red

8. Virus Structure (General)

Moderate chance
Label:
  • Capsid (protein coat)
  • Nucleic acid (DNA or RNA inside)
  • Envelope (in enveloped viruses, e.g., HIV, Influenza)
  • Spikes/Surface antigens
  • No cell organelles, no ribosomes

πŸ“Œ ANATOMY β€” ADDITIONAL HIGH-CHANCE DIAGRAMS

9. Digestive System

Label sequentially:
  • Mouth β†’ Esophagus β†’ Stomach β†’ Duodenum β†’ Jejunum β†’ Ileum β†’ Cecum β†’ Ascending/Transverse/Descending Colon β†’ Rectum β†’ Anus
  • Accessory organs: Liver, Gallbladder, Pancreas (with their ducts)

10. Cross-Section of the Spinal Cord

  • Grey matter (H-shaped, contains anterior/posterior horns)
  • White matter (surrounds grey matter)
  • Central canal
  • Dorsal root (sensory), Ventral root (motor)
  • Dorsal root ganglion

πŸ“Œ QUICK MEMORY TIPS FOR EXAM

DiagramKey Point to Remember
HeartBlood flow direction: Body β†’ RA β†’ RV β†’ Lungs β†’ LA β†’ LV β†’ Body
NeuronDendrites = receive; Axon = send impulse
NephronFiltration in Bowman's capsule; reabsorption in PCT & Loop of Henle
Gram stain+ve = Purple (thick wall retains violet); βˆ’ve = Pink (thin wall decolorized)
Endocrine axisHypothalamus β†’ Pituitary β†’ Target organ β†’ Negative feedback
LungsRight = 3 lobes; Left = 2 lobes (heart indentation)
Preparation tip: For each diagram, practice labeling it at least 3 times without looking. Examiners award marks for neatness, correct labels, and arrows showing direction (especially for heart and nephron). All diagrams above are commonly asked in both short answer (2-mark diagrams) and long answer (with explanation) format in GNM board and internal exams.
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