ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In thirst reflex osmoregulation feedback model, low water content in plasma leading to decreased saliva production and a dry mouth is the
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stimulus
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receptor
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modulator
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effector
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response
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Explanation:
Detailed explanation-1: -(A) The most potent hormonal stimulus for thirst is angiotensin II (AngII), which is generated when the rate-limiting enzyme renin is secreted by the kidneys in response to hypovolemia or hypotension.
Detailed explanation-2: -It has long been recognized that thirst is stimulated by increases in the extracellular concentration of nonpermeable osmolytes, such as Na+, that cause osmotic movement of water from body cells.
Detailed explanation-3: -Osmoreceptors are situated in the brain, but on the blood side of the blood-brain barrier in a circumventricular organ. These regions are stimulated by an increase in plasma osmolality and form the most important input to cause thirst and drinking.
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