ATI Pathophysiology Practice Exam

The release of antidiuretic hormone (ADH), also known as vasopressin, primarily acts on the kidneys to promote water reabsorption. When ADH is secreted, it increases the permeability of the kidney tubules, allowing more water to be reabsorbed back into the bloodstream rather than being excreted as urine. This process results in an increased fluid volume in the body.

As a consequence of enhanced water retention, the overall fluid balance in the body shifts, leading to an increase in blood volume. An increase in blood volume can also support blood pressure stabilization rather than a direct decrease. Thus, the correct response to the question about what occurs due to ADH release is that the fluid volume in the body increases, reflecting the hormone's function in regulating body fluid homeostasis.