Absorption of $H_{2} O$ in DCT is controlled by

ADH

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ACTH

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Oxytocin

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Solution

The correct option is A ADH
The water reabsorption in the distal part of the nephron is in accordance with the body's state of hydration, under the influence of ADH and is termed as 'facultative reabsorption of water'. ADH is secreted in the hypothalamus of brain and released into blood stream from the pituitary gland. The collecting ducts become more permeable to water due to the effect of ADH, so more water is reabsorbed by osmosis and no expenditure of ATP energy is required. The release of ADH is triggered when osmoreceptors in the hypothalamus detect an increase in osmolarity of the blood above a set point of $300 m o s m L^{- 1}$ . In this situation the osmoreceptors cells also promotes thirst. Drinking reduces the osmolarity of the blood, which inhibits the secretion of ADH.

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Similar questions

N a^{+}

H C O_{3}

H^{+}

K^{+}

N H_{3}

p H

N a^{+} - K^{+}

A. Vasopressin	I. Excretion of $K^{+}$ ions and absorption of ${Na}^{+}$ ions in DCT and CCT
B. Aldosterone	II. Converts Angiotensinogen to Angiotensin I
C. Atrial Natriuretic Factor	III. Receptors are present in DCT, CCT and MCT to absorb water
D. Renin	IV. Decreases blood volume by decreasing ${Na}^{+}$ reabsorption in DCT and CCT

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