BIOL 120 Lecture Notes - Lecture 20: Distal Convoluted Tubule, Proximal Tubule, Macula Densa

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Consists of a renal corpuscule + renal tubule. Dead-end tube that surrounds the glomerular capillaries. Fluid filtered from the glomerular capillaries enters space between the visceral and parietal layers of the glomerular capsule. Proximal convoluted tubule nephron loop distal convoluted tubule collecting ducts collecting ducts drain into large papillary ducts. Descending + ascending limbs of nephron loop. Distal convoluted tubule drains into collecting duct. Columnar tubule cells in this region that are crowded. Collecting ducts of renal tubules converge until eventually there are several hundred large papillary ducts => these drain into minor calyces. Extend from renal cortex through renal medulla to renal pelvis. Short loop that dips only into superficial region of renal medulla long nephron loop that stretches through medulla almost to renal papilla. Enable kidneys to excrete very concentrated urine juxtaglomerular apparatus (jga) juxtaglomerular cells of an afferent arteriole + the macula densa of the final portion of the ascending limb of the nephron loop.

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