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Physiology

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Central Nervous System

Question
8 out of 18
 

Thirst is activated by:(DNB Jun-2009)



A Increased Angiotensin I level

B Extracellular hyperosmolarity

C Increased ANP levels

D Increased renin levels

Ans. B Extracellular hyperosmolarity
  1. Drinking is regulated by plasma osmolality and extracellular fluid volume in much the same way as vasopressin secretion.
  2. Water intake is increased by increased effective osmotic pressure of the plasma, by decrease in extracellular fluid volume, and by psychologic and other factors.
  3. Injection of hypertonic saline into the anterior hypothalamus causes drinking in animals by acting on osmoreceptors. Q

Central Nervous System Flashcard List

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