Human Physiology & Anatomy for the Biology Olympiad

Explore epithelial tissues, their polarity and basement membrane, junctions, and the diverse forms—simple and stratified, squamous, cuboidal, and columnar—plus glandular and sensory roles.

This episode explains muscle tissue, where actin and myosin drive contraction to generate movement; it covers skeletal, cardiac, and smooth muscle types and their key features.

Explore how action potentials propagate along axons, showing that larger axon diameter and myelination speed conduction, with saltatory conduction at nodes, and how demyelinating diseases disrupt this process.

Explore reflexes as rapid, involuntary responses governed by the spinal cord, including mono- and poly-synaptic reflex arcs, autonomic and somatic pathways, and receptors like muscle spindles and Goji tendon organs.

Explore leukopoiesis and how hematopoietic stem cells differentiate into myeloid and lymphoid lineages, detailing neutrophils, eosinophils, basophils, monocytes, and lymphocytes, their tissue migration and chemotaxis to defend against pathogens.

Examine nontraditional endocrine organs such as the thymus, heart, adipose tissue, skin, and kidneys, detailing hormones like atrial natriuretic peptide, leptin, adiponectin, vitamin d activation, erythropoietin, and renin-angiotensin-aldosterone effects.

Explore how innate and adaptive immunity defend against pathogens, from skin and mucosa barriers to toll-like receptors and T and B cell-mediated responses, including antibodies to specific antigens.

Explore the acquired immune system and how T cells and B cells provide targeted, memory-based defenses. Learn about active and passive immunity, antigen recognition, and immune tolerance.

Explore how V(D)J recombination in bone marrow and thymus reshapes B and T lymphocytes to generate diverse antibodies and receptors via heavy and light chains and V,D,J segments.

Examine the nephron across cortex and medulla, detailing glomerulus, Bowman's capsule, proximal tubule, loop of Henle, distal tubule, collecting ducts, and cortical vs juxtamedullary differences.

Explore how kidneys form urine by filtration in the glomerulus and Bowman's capsule across filtration membrane. Understand how hydrostatic pressure and afferent arterial and effluent arterial changes set the GFR.