Question

Which of the following statements is correct? a. Aldosterone is secreted in response to elevated levels of sodium in the blood. b. Aldosterone promotes sodium reabsorption in the kidneys. c. Aldosterone helps decrease blood volume. d. Aldosterone increases the concentration of sodium in the urine.

Answer 1

The statement 'b. Aldosterone promotes sodium reabsorption in the kidneys' is correct. Aldosterone helps regulate electrolyte balance, increasing sodium reabsorption and water retention, leading to elevated blood volume and pressure while also excreting potassium.

Step-by-step explanation:

The correct statement among the options given is: b. Aldosterone promotes sodium reabsorption in the kidneys. Aldosterone is a hormone secreted by the adrenal cortex, and it plays a vital role in regulating sodium and potassium balance within the body. It is released in response to several conditions, including low blood volume, low blood pressure, or high levels of potassium in the blood. The primary function of aldosterone is to increase the reabsorption of sodium ions in the distal convoluted tubules and collecting ducts of the kidneys. When sodium is reabsorbed, water follows due to osmosis, leading to an increase in blood volume and blood pressure. Conversely, aldosterone also stimulates the excretion of potassium, thereby reducing its levels in the blood.

Answer 2

b. Aldosterone promotes sodium reabsorption in the kidneys.

Step-by-step explanation:

Once it is produced by the adrenal gland it stimulates the mineralocorticoid receptors on the distal tubule and collecting duct of the kidney's nephrons. This causes sodium reabsorption in the kidneys indirectly affecting water retention.