You are a medical education content researcher. Your job is to extract comprehensive study notes for MBBS First Year Physiology from the medical textbook library database. The library has these physiology books (use Costanzo 9780323793339 as primary source, supplement with Ganong 9781260122404 and Guyton 9780443111013): Read these block files to extract content for ALL major MBBS 1st Year Physiology topics: - /textbooks/9780323793339/9780323793339_block1.md (Cell physiology, transport, membrane) - /textbooks/9780323793339/9780323793339_block2.md - /textbooks/9780323793339/9780323793339_block3.md - /textbooks/9780323793339/9780323793339_block4.md For each block, read offset=0, limit=100, then continue with offset=100, limit=100, etc. until you have covered the key concepts. Compile detailed study notes covering ALL of these MBBS 1st Year Physiology topics: 1. **General Physiology** - Body fluid compartments (ICF, ECF, plasma, interstitial) - Cell membrane structure (phospholipid bilayer, proteins) - Transport mechanisms (simple diffusion, facilitated diffusion, active transport, osmosis) - Resting membrane potential (Nernst equation, Goldman equation) - Action potential (phases, ionic basis, refractory periods) - Synaptic transmission (neuromuscular junction, EPP) 2. **Blood Physiology** - Composition of blood (plasma, formed elements) - Erythrocytes: structure, function, lifespan, destruction - Hemoglobin: structure, types, oxygen dissociation curve, Bohr effect - Anemia: classification, features - WBCs: types, functions, normal counts - Platelets: structure, functions - Hemostasis & coagulation cascade (intrinsic, extrinsic, common pathways) - Blood groups (ABO, Rh) - ESR: factors, clinical significance 3. **Nerve & Muscle Physiology** - Nerve fiber classification (A, B, C fibers) - Neuromuscular junction - Skeletal muscle structure (sarcomere, actin, myosin) - Sliding filament theory of muscle contraction - Excitation-contraction coupling - Smooth muscle & cardiac muscle differences 4. **Cardiovascular Physiology** - Cardiac cycle (systole, diastole, phases) - Heart sounds - ECG (waves, intervals, segments) - Cardiac output & its regulation - Blood pressure: factors, regulation (Starling's law, Frank-Starling) - Baroreceptor reflex - Microcirculation & lymphatics 5. **Respiratory Physiology** - Lung volumes and capacities (TV, IRV, ERV, RV, TLC, FRC, VC) - Mechanics of breathing (compliance, surfactant) - Ventilation-perfusion ratio - Oxygen transport (oxyhemoglobin dissociation curve) - CO2 transport - Control of respiration (central, peripheral chemoreceptors) 6. **Renal Physiology** - Structure of nephron - Glomerular filtration (GFR, filtration fraction) - Tubular reabsorption and secretion - Countercurrent mechanism (concentration of urine) - Regulation of body fluid osmolarity (ADH, aldosterone) - Renin-Angiotensin-Aldosterone System (RAAS) - Renal clearance 7. **Gastrointestinal Physiology** - Salivary secretion - Gastric secretion (HCl, pepsin, intrinsic factor) - Pancreatic secretion - Bile: composition, functions - Digestion and absorption (carbohydrates, proteins, fats) - GI motility 8. **Endocrine Physiology** - Hypothalamus-pituitary axis - Growth hormone - Thyroid hormones (synthesis, functions) - Adrenal cortex (cortisol, aldosterone) & medulla (adrenaline) - Insulin and glucagon - Parathyroid hormone, Calcitonin, Vitamin D 9. **Neurophysiology** - Sensory receptors and transduction - Spinal cord reflexes (stretch reflex, withdrawal reflex) - Thalamus and cerebral cortex functions - Cerebellum functions - Autonomic nervous system (sympathetic vs parasympathetic) - Sleep physiology (NREM, REM) 10. **Special Senses** - Eye: accommodation, visual acuity - Ear: auditory transduction, vestibular function For each topic, provide: - Key definitions - Important mechanisms/pathways - Normal values (where applicable) - Clinical correlations mentioned in textbooks Use read_file to read the block files. Read in chunks of 100 lines at a time. Focus on extracting factual, exam-relevant content. Return a comprehensive, well-organized JSON structure with all the content organized by topic. The JSON should have keys for each major system (general_physiology, blood, nerve_muscle, cardiovascular, respiratory, renal, gi, endocrine, neurophysiology, special_senses), and under each key, an array of subtopics, each with "heading" and "content" (array of bullet points/paragraphs). IMPORTANT: Return the full JSON in your response so it can be used to generate the PDF.