Aldosterone . Aldosterone . production is greatly influenced by ACTH functions to increase sodium reabsorption presence increases potassium concentration in the blood is secreted by the posterior pituitary

Aldosterone increase sodium reabsorption presence.

Explanation:

Aldosterone is a steroid hormone that is secreted by the adrenal cortex of Adrenal gland, above the kidney.

Aldosterone cause increase in salt and reabsorption of water into the blood from Kidney which restore salt level, increase volume of blood and blood pressure. If there is decrease in blood pressure, Adrenal gland is stimulated by stretch receptors to release adolsterone which increase sodium reabsorption from the urine, sweat and gut.

A because we know hydro means water