Aldosterone is a hormone made by the outer portion of the adrenal gland. It is one of the most important hormones that regulates the body's electrolyte balance. It's purpose is to regulate the balance of salt and water within the body. When salt levels become low within the body, aldosterone is produced. Aldosterone then activates the mineralocorticoid receptor gene. Once this is activated it tells the kidneys to reabsorb salt, thereby retaining water.
Atrial natriuretic is a vasodialator and hormone secreted by the heart. It is involved in the balance of water, sodium, potassium, and fat. When blood pressure becomes to high atrial natriuretic is released from the upper chambers of the heart. Once released it assists with the reduction of water, sodium and fat loads on the circulatory system. In doing this, it lowers blood pressure.
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