BIOLOGY 2A03 Lecture Notes - Lecture 50: Respiratory Alkalosis, Angiotensin-Converting Enzyme, Vascular Resistance
21 Apr 2016
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Detrusor (smooth) muscle: under psns control contracts to push urine out of bladder. External urethral sphincter: composed of skeletal muscle; under somatic ns control. 1l when filled: psnd inactive to relax detrusor muscle for filling, sns + somatic ns are active to contract urethral sphincters. Micturition: the ejection of urine from the urinary bladder. The nephron functional unit in kidney; has rich blood supply. Each renal pyramid has 100,000-200,000 nephrons; 8-15 pyramids per kidney, each with separate branches of renal artery & vein. Renal tube: a single winding tube along with urine flows and gets progressively modified. Blood supply comes from renal artery that travels through cortex; different capillary beds in nephron. Portal system: blood supply composed of two capillary beds; blood first enters glomerulus in afferent arteriole and then travels to either the peritubular capillaries or vasa recta in efferent arteriole. Increase in map leads to constriction of afferent arteriole increases resistance. Decreases glomerular capillary pressure decrease gfr.
