🚽01
The Urinary System
Kidneys, ureters, bladder, and urethra.
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Kidney Anatomy
Cortex, medulla, pyramids, calyces, and pelvis in cross-section.
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The Nephron
The microscopic filtering unit, from glomerulus to collecting duct.
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Urine Formation
Filtration, reabsorption, and secretion — 180 L down to 1.5 L.
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Hormonal Control
ADH, aldosterone, RAAS, and ANP tune water and salt.
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The Micturition Reflex
Fill the bladder, feel the urge, and void.
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