Which of the Following is Used to Promote Water Reabsorption

Question

Which of the following is used to promote water reabsorption by the kidneys?
A)Antidiuretic hormone
B)ANP
C)Aldosterone
D)Parathyroid hormone
E)All of these choices

Accepted Answer

Antidiuretic hormone (ADH) is responsible for promoting water reabsorption by the kidneys. It is produced in the hypothalamus and secreted by the posterior pituitary gland in response to changes in blood osmotic pressure. When ADH binds to receptors on the collecting ducts of the kidneys, it increases the permeability of the walls, allowing more water to be reabsorbed back into the bloodstream, thereby reducing urine output. ANP (atrial natriuretic peptide) works opposite to ADH by inhibiting its production, promoting water loss by the kidneys, and decreasing blood volume and pressure. Aldosterone regulates sodium reabsorption in the renal tubules and collecting ducts, which indirectly promotes water retention. Parathyroid hormone is responsible for maintaining calcium homeostasis in the body and has no direct effect on water reabsorption by the kidneys.