When the posterior lobe of the pituitary is stimulated to increase its secretion of ADH,the first event to occur is a(n):

Question

Quizplus · Accepted Answer

ADH (antidiuretic hormone) increases the permeability of the kidney tubules to water, which results in increased reabsorption of water from the filtrate and decreased urine volume. This is the first event to occur when the posterior lobe of the pituitary is stimulated to increase its secretion of ADH. Option A is incorrect because an increase in urine volume would not be the first event to occur. Option C is incorrect because an increase in ADH would not lead to a decrease in kidney tubule reabsorption of water. Option D is incorrect because an increase in ADH would not lead to a decrease in extracellular fluid volume.

When the Posterior Lobe of the Pituitary Is Stimulated to Increase