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Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYExcretory Products and their Elimination2 Marks
Question
How does ADH regulate body fluid volume? Explain.
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Answer

Excessive loss of fluid from the body activates osmoreceptors, which stimulate the hypothalamus to release ADH from the neurohypophysis. ADH facilitates water reabsorption from posterior parts of tubule. This decreases osmolarity of blood. An increase in body fluid volume can switch off the osmoreceptors and suppress the ADH release to complete the feedback. ADH also causes constrictory effects on blood vessels.

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