The main hormone that acts on the kidneys to regulate sodium ion concentration of the extracellular fluid (ECF) is ________.
A) antidiuretic hormone (ADH)
B) renin
C) secretin
D) aldosterone
E) epinephrine

Question

Quizplus · Accepted Answer

Aldosterone is the main hormone that acts on the kidneys to regulate sodium ion concentration of the extracellular fluid (ECF). It is produced by the adrenal cortex and causes the kidneys to reabsorb sodium ions and excrete potassium ions, thereby regulating the levels of these ions in the ECF. ADH also plays a role in regulating water balance, but not specifically sodium ion concentration. Renin is involved in the renin-angiotensin-aldosterone system and helps regulate blood pressure, but not specifically sodium ion concentration. Secretin is involved in regulating digestive processes and does not have a direct role in regulating sodium ion concentration. Epinephrine is involved in regulating the body's response to stress and does not have a direct role in regulating sodium ion concentration.

The Main Hormone That Acts on the Kidneys to Regulate