PHYSL402 Lecture 17: L18
7 Nov 2016
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Regulation of water and electrolyte balance crucial: reg bv over time (recall = lt player) Hilum: through which pass renal artery, vein, lymphatics, nerve supply and ureter. Base of pyramid at border of cortex and medulla, point terminates in renal papilla. Papilla projects to renal pelvis divided into calyces (pouches) collect urine from each papilla. Lymphatics have one way valves and also propels blood back to circulation. Some nephrons so long that they extend to end of renal papilla. Renal blood flow 22% of cardiac output (way more than it needs = filter and regulator) Renal artery enters kidney at hilum branches progressively smaller: interlobar arcuate interlobular afferent glomerular capillaries. Vessels coalesce to form efferent arterioles then form peritubular capillaries (surround renal tubules) Reabsorption; systemic = 25-35; here ~ 40+ mmhg. Joins inferior vena cava and goes back to heart. Role: maintain bv and filtering + homeostasis + steady [ ] of fluid/electrolyte osmolarity.
