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excertion III 2012 final

excertion III 2012 final - The Kidney III Final Steps The...

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The Kidney III Final Steps The key role of the Vasa Recta in regulating kidney function Regulating water resorption Vasopressin Renin Angiotensin Monday, April 30, 12
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What would happen if the blood after reaching the medulla simply exited on the pelvic side? Monday, April 30, 12
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What would happen if the blood after reaching the medulla simply exited on the pelvic side? The walls of the capillaries are freely permeable to water As the capillaries descend deeper into the medulla they would loss water via osmosis and pickup NaCl and urea by diffusion In other words if the capillaries passed through they would disrupt the medullar interstitial gradients Monday, April 30, 12
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The medullar capillaries form hairpin loops called vasa recta that parallel the loops of Henle The vasa recta uses countercurrent exchange to avoid disrupting the the steep solute gradients of the medulla Diving into the medulla: blood losses water gains salt On its way out: blood resorbs water and yields solutes Monday, April 30, 12
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Defining Homeostasis Regulating production of concentrated urine Monday, April 30, 12
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The final concentration urine is dependent upon the rate of H 2 O resorption in the distal collecting tubule Vasopressin or antidiuretic hormone (ADH) regulates water resorption Monday, April 30, 12
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