Essay 29 - Kidney

Essay 29 - Kidney - Bio Essay 29 Using your knowledge of...

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Bio Essay 29 Using your knowledge of the structure and function of the nephron, explain how your kidneys can selectively excrete some small molecules while retaining others, like amino acids and at the same time regulate the pH and the osmolarity of your tissues. I. Basic Structure Figures 44.13, 44.14, 44.15 a)Afferent arteriole blood to glomerulus Proximal tube (peritubular capillaries) Loop of Henle (interacts with vasa recta) Distal Tube (peritubular capillaries) Collecting Duct Excreted as urine II. Movement Through Nephron Blood under pressure enters nephron at glomerulus A) First entry after glomerulus Water, K+, HCO 3 - passively retained, reabsorbed out of the nephron into the capillaries NH 3 actively secreted because it prevents the filtrate from becoming too acidic (pH control) NaCl (actively reabsorbed because it is in an area of normal salt concentration---the cortex) and nutrients (amino acids) actively reabsorbed into peritubular capillaries H+ is pumped in, secreted
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Essay 29 - Kidney - Bio Essay 29 Using your knowledge of...

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