medium · MCAT bio-biochem
A researcher observes that a subject's plasma osmolarity has risen to 305 mOsm/L. In response, the posterior pituitary releases antidiuretic hormone (ADH).
Which cellular change occurs in the collecting duct cells to restore homeostasis?
- Insertion of aquaporin channels into the apical membrane increases water permeability.
- Increased synthesis of aldosterone receptors promotes the reabsorption of free water.
- Activation of sodium-potassium pumps increases the active transport of water into the vasa recta.
- Inhibition of the cyclic AMP second messenger system prevents the loss of water in the urine.
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