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Find what is the correct approach to the action of ADH (Antidiuretic Hormone):
A.-Its role is to increase blood volume, and therefore blood pressure, by enhancing Na+ reabsorption
B.-It reduces blood Na+, there by decreasing blood volume and blood pressure.
C.-It inhibits diuresis or urine output. It makes the principal cells of the collecting duct more permeable to water by causing aquaporin to be inserted into their apical membranes.
D.-Powerful vasodilator action
E.-It facilitates the conversion of angiotensinogen to angiotensin I.

Respuesta :

Answer:

Option (C).

Explanation:

Antidiuretic hormone or vasopressin is a hormone, synthesized by hypothalamus and released by posterior pituitary gland. The main function of ADH is to regulate amount of water in blood as it decreases urine formation at the time of low blood pressure.

ADH shows its antidiuretic effect by increasing reabsorption of water by cells of collecting duct. It increases water permeability in renal duct by triggering fusion of AQP-2 (aquaporin-2) bearing vesicles on apical membranes of renal cells that leads to enhanced water absorption by these cells and decrease in urine formation.

Thus, the correct answer is option (C).  

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