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BIOLOGY TOPIC 11 ANIMAL PHYSIOLOGY (HL)

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Question:

Describe the process of selective reabsorption and the parts of the nephron used (9)

Author: Sammy Universe



Answer:

Reuptakes useful materials from filtrate in the convoluted tubes reabsorbs ions, amino acids, glucose, H2O, hormones, vitamins the tubule has: microvilli: increase SA for absorption from filtrate single cell thick and tight junction = thin surface Lots of mitochondria: active transport Substances are actively transported across the apical membrane and then passively diffuse across basolateral membrane Ions + vitamins = actively transported w protein pumps + carrier proteins Glucose + amino acids co transported across apical w Na+ (symport) water follows the movement of ions passively w osmosis


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