As serum osmolality rises, intravascular fluid equilibrium will be maintained by the release of
a. ketones.
b. glucagon.
c. antidiuretic hormone.
d. potassium.
C
When the serum osmolality level increases, antidiuretic hormone is released from the posterior pituitary gland and stimulates increased water resorption in the kidney tubules. This expands the vascular space, returns the serum osmolality level back to normal, and results in more concentrated urine and an elevated urine osmolality level.
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