The Atrial wall of the human heart secretes a very important peptide hormone. What is the name of that hormone?

ANF

The correct answer is Option (2)- ANF

Atrial Natriuretic Peptide (ANF), also known as atrial natriuretic factor, is a hormone released by the atrial walls of the heart. It plays a crucial role in regulating blood pressure and fluid balance in the body. Here's an explanation of its main functions:

• Blood Pressure Regulation: ANF helps regulate blood pressure by promoting vasodilation (relaxation of blood vessels). This dilation leads to increased blood flow and decreased resistance, reducing blood pressure.
• Fluid Balance: ANF promotes the excretion of sodium and water by the kidneys. This helps to reduce the volume of blood and, consequently, lowers blood pressure. By inhibiting the reabsorption of sodium in the renal tubules, ANF promotes the elimination of excess salt and water in the urine.

ADH or Anti Diuretic hormone is generated naturally in the hypothalamus of the brain, it is then released by the pituitary gland situated at the base of the brain.

CCK or cholecystokinin is a hormone discharged by the upper small intestine’s I-cells in response to protein, fat, and some non-nutrients.

Gastric Inhibitory Peptide (GIP) is a hormone released by the small intestine, particularly the duodenum and jejunum, in response to the presence of food, especially fats and glucose.