MEDICAL
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: -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-2: -Glucose, amino acids, NaCl and other essential salts are reabsorbed in the second step of urine formation i.e Tubular Reabsorption.
Detailed explanation-3: -As the collecting duct descends through the medulla, the increasing osmolarity in the surrounding interstitial fluid drives water reabsorption.
Detailed explanation-4: -The collecting ducts, under the influence of ADH, can recover almost all of the water passing through them, in cases of dehydration, or almost none of the water, in cases of over-hydration.