When the body needs to conserve water, the kidneys extract a hypertonic urine, since the fluid is to become urine begins as plasma what must happen to change it to a hypertonic urine?
by 
T.J.
ANSWERS: 1
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Osmolality rises, which causes the kidneys to secrete anti-diuretic hormones, which increases water re-absorption and urine concentration goes up. These anti-diuretic hormones (called vasopressin, which also functions as a sodium regulator) are what cause plasma to turn hypertonic.
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