EXCRETORY SYSTEM
KIDNEY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ions like Na+ and Cl-
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Nutrients like glucose and amino acids
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Substances like drug metabolites and waste
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Water
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Detailed explanation-1: -Final answer: Proximal convoluted tubule is involved in reabsorption of water even in presence of hormone ADH (Anti-diuretic hormone).
Detailed explanation-2: -ADH primarily affects the ability of the kidney to reabsorb water; when present, ADH induces expression of water transport proteins in the late distal tubule and collecting duct to increase water reabsorption.
Detailed explanation-3: -The main role of the collecting duct is the reabsorption of water, through the action of anti-diuretic hormone (ADH) and aquaporins. ADH is produced in the hypothalamus, and stored in the posterior pituitary gland until it is released.
Detailed explanation-4: -ADH then acts primarily in the kidneys to increase water reabsorption, thus returning the osmolarity to baseline.
Detailed explanation-5: -The ability of the cortical collecting duct to absorb water is controlled by antidiuretic hormone (ADH). In the presence of ADH, AQP2-containing vesicles fuse with the apical membrane allowing water to enter the cell. Water exits from the basolateral aspect via AQP3 and AQP4 channels.