Increase in aldosterone levels
Decrease in antidiuretic hormone levels
None of the above
Decrease in aldosterone levels
Aldosterone, a hormone secreted by the adrenal cortex, stimulates the renal absorption of sodium ions and water, thereby increasing blood volume. A reduced aldosterone level would actually increase sodium secretion by the distal convoluted tubule (DCT). Antidiuretic hormone (ADH), secreted by the posterior pituitary gland, targets nephrons to increase water reabsorption, thus decreasing water content in urine. Therefore, an increase in aldosterone levels (option A) is the correct answer.