Blood Supply - to drain into the interlobular, arcuate,...

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Urinary System Blood Supply * Receives 21% of the cardiac output * •attests to their importance in controlling blood volume and composition * •Each kidney is supplied by a renal artery (sometimes 2 or more) Blood Supply * Renal aretery enters hilum and divides to segmental arteries * Segmental arteries divide into interlobular arteries which penetrate each renal column and travels between the pyramids to the cortico- medullary junction where it branches to form the arcuate ateries * Arcuate arteries run parallel along the base of the pyramid and branches to give rise to several interlobular arteries , which pass upward into the cortex to form the afferent arterioles Blood Supply * The interlobular artery gives of afferent arterioles to the glomerulus of each nephron * The glomerulus is drained by an efferent arteriole * The efferent arterioles leads next to a plexus of peritublar capillaries
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Unformatted text preview: to drain into the interlobular, arcuate, interlobar, and renal veins. Juxtaglomerular Apparatus * Area just outside the capsule where the afferent and efferent arterioles contacts the first part of the DCT * Enables the nephron to monitor and stabilize its own performance and compensate for fluctuations in blood pressure. Nerve Supply * Renal nerves arise from the superior mesenteric ganglion and enter the kidney at the hilium. * They follow the branches of the renal artery to innervate each nephron * Consist mostly of sympathetic fibers that regulate blood flow into and out of each nephron thus controlling the filtration rate and urine formation Urine Formation Urine Formation I: Glomerular Filtration The kidney converts blood plasma to urine in three stages * Glomerular filtration * Tubular reabsorption and secretion * Water conservation...
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