ANIMAL PHYSIOLOGY
EXCRETION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Less ADH is released, causing more water to be reabsorbed in the nephrons
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More ADH is released, causing less water to be reabsorbed in the nephrons
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More ADH is released, causing more water to be reabsorbed in the nephrons
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Detailed explanation-1: -More ADH will be released, which results in water being reabsorbed and a more concentrated but smaller volume of urine will be produced. This type of control is an example of the negative feedback mechanism. It aims to keep the concentration of the blood plasma constant.
Detailed explanation-2: -High levels of anti-diuretic hormone cause the kidneys to retain water in the body.
Detailed explanation-3: -ADH signals the kidneys to recover water from urine, effectively diluting the blood plasma. To conserve water, the hypothalamus of a dehydrated person also sends signals via the sympathetic nervous system to the salivary glands in the mouth.
Detailed explanation-4: -[2] Therefore, slight elevations in osmolarity result in the secretion of ADH. ADH then acts primarily in the kidneys to increase water reabsorption, thus returning the osmolarity to baseline.
Detailed explanation-5: -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.