On which of the following site the posterior pituitary hormone acts predominantly?
Correct answer: D. Collecting tubules
- A. Proximal convoluted tubule
- B. Descending limb of loop of Henle
- C. Ascending limb of loop of Henle
- D. Collecting tubules
Explanation
Antidiuretic hormone from the posterior pituitary acts mainly on collecting tubules, increasing their permeability to water and allowing concentrated urine to form. Students may choose the proximal convoluted tubule because extensive reabsorption occurs there, but ADH specifically regulates water permeability in the collecting tubules.
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The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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