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BIOLOGY TOPIC 11 ANIMAL PHYSIOLOGY (HL)
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Question:
Label and identify the functions of the different parts of the nephron (4)
Author: Sammy UniverseAnswer:
Bowman's capsule: contains the glomerulus which filters the blood with hydrostatic pressure from the wide afferent and narrow efferent which creates a pressure gradient within. The basement membrane and podocytes filter out large molecules such as blood and proteins Proximal convoluted tubule: folded structure connected to the bowman's capsule where selective reabsorption occurs. Ions are actively transported with protein pumps Amino acids and glucose are transported with Na+ and H2O passively moves through with the movement of the ions with osmosis Loop Of Henle: a selective permeable loop that goes down to the medulla and creates a salt gradient to draw water out of the collecting duct. it does this by creating more solute in the medulla. The descending loop is permeable to water but not salts which makes the curve in the medulla very hypertonic Distal convoluted tube: more reabsorption occurs here (ADH is released here)
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