ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Less ADH will be secreted by the pituitary.
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Less water will be reabsorbed back into the blood.
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Osmoreceptors in the hypothalamus will detect decreased blood concentration.
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The volume of urine will increase.
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More ADH will be secreted by the pituitary.
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Detailed explanation-1: -Your body normally produces and releases more ADH when you’re dehydrated or losing blood pressure. The increase in ADH tells your kidneys to hold onto more water instead of releasing it in your pee (urine).
Detailed explanation-2: -Dehydration causes the hypothalamus to release ADH (antidiuretic hormone) via the posterior pituitary gland. The ADH signal tells the kidneys to recover water from urine, which dilutes the blood plasma.
Detailed explanation-3: -Aldosterone and ADH secretion increased following dehydration. It is suggested that the ADH. besides its water reabsorptive functions in the kidney, initiates aldosterone secretion. The aldosterone then works primarily on the colon causing absorption of salt and water.
Detailed explanation-4: -Antidiuretic hormone (ADH) is a chemical produced in the brain that causes the kidneys to release less water, decreasing the amount of urine produced. A high ADH level causes the body to produce less urine. A low level results in greater urine production.
Detailed explanation-5: -If water is in excess, ADH levels are reduced limiting the amount of water resorbed back into the blood but increasing the volume eliminated in the urine. If you drink a pint or so of fluid you will notice that within an hour your urine volume will increase and the excess water will therefore be eliminated.