Human Physiology for Health and Medical Sciences

The nervous system acts as the body's fast communication network, using the central nervous system and peripheral nervous system to sense, decide, and respond with voluntary and involuntary actions.

Explore how neurons use resting membrane potential and action potentials across the axon to fire quickly, while chemical synapses release neurotransmitters like acetylcholine and dopamine at receptors.

Understand how the CNS and PNS coordinate processing, reflex arcs, and sensory physiology—detecting touch, temperature, pain, and position—to guide rapid actions and maintain balance.

Coordinate the autonomic nervous system to balance sympathetic readiness and parasympathetic rest, regulating involuntary actions like heart rate, digestion, and pupil response during stress and recovery.

Explore how hormones regulate growth, metabolism, stress response, and reproduction through blood-borne signals, receptor specificity, and pituitary-coordinated negative feedback involving thyroid, adrenal, and pancreas.

Explore the major endocrine glands—pituitary, thyroid, adrenal, and pancreas—and how their hormones regulate growth, metabolism, stress response, and blood glucose to maintain body balance.

Explore how the heart’s four chambers and valves drive blood flow through diastole and systol, with atrial systole aiding ventricle filling and cardiac output equals heart rate times stroke volume.

Understand the heart’s intrinsic electrical system, from SA node through AV node and Purkinje fibers, and how the ECG records this activity with P wave, QRS complex, and T wave.

Explore how arteries, veins, and capillaries form a vessel network that matches structure to function, enables exchange at capillaries, and uses arterioles to adjust flow and maintain blood pressure.

Grasp how breathing works as a pressure-driven process tied to chest expansion and the diaphragm. Examine lung volumes from tidal to residual and how compliance and elasticity shape ventilation.

Explore gas exchange in alveoli, where diffusion follows partial pressure gradients to move oxygen into blood and carbon dioxide out, with the bicarbonate system and brainstem regulating breathing and pH.

Kidneys act as steady filters, forming urine through nephrons in the cortex and medulla with glomerulus filtration, tubule reabsorption, and collecting duct regulation, guided by ADH.

Explore how intracellular and extracellular water, electrolytes such as sodium and potassium, and acid–base regulation through ADH, aldosterone, respiration, and kidneys maintain homeostasis.

Explore how segmentation and peristalsis move and mix digestion through pacemaker rhythms and the enteric nervous system, with gastrin, CCK, and autonomic control coordinating stomach and intestinal motility.

Explore how saliva starts carbohydrate digestion, how stomach acid and pepsin break down proteins, and how pancreas, liver, and small intestine enzymes digest and absorb nutrients.

Explore how skeletal muscles use fascicles and sarcomeres, with actin and myosin sliding to shorten fibers and create movement, powered by ATP and calcium.

Explore how smooth and cardiac muscles contract involuntarily to move organs and keep the heart beating, using calcium signaling, calmodulin, gap junctions, and pacemaker activity.

Explore the body's two-layer defense: innate immunity provides immediate, non-specific protection with barriers and fast-acting cells, while adaptive immunity offers specific, learned responses and memory through B and T cells.

Explore how neutrophils, macrophages, dendritic cells, and lymphocytes coordinate innate and adaptive immunity. See how inflammation recruits immune cells, uses cytokine signals, and balances defense with tissue protection.

Understand the male reproductive system, including spermatogenesis in the semi-inferior tubules, Sertoli and leading cells, and hormonal control via GnRH, LH, and FSH that regulate testosterone and sperm production.

Explore how the female reproductive system coordinates ovaries, the menstrual cycle stages, ovulation, fertilization, implantation, and early pregnancy with hormones like GnRH, FSH, LH, estrogen, and progesterone.