BIOLOGY
HORMONES
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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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More water will be reabsorbed back into the blood.
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Osmoreceptors in the hypothalamus will detect increased 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: -ADH reduces water loss via lowered urine volume. Extracellular dehydration (hypovolaemia) stimulates specific vascular receptors that signal brain centres to initiate drinking and ADH release.
Detailed explanation-2: -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-3: -A high ADH level causes the body to produce less urine. A low level results in greater urine production. Normally, the amount of ADH in the body is higher during the night. This helps prevent urination while you are sleeping.
Detailed explanation-4: -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.