Question

Which of the following hormones is secreted by the atrial wall of the human heart?

• A. ADH
• B. ANF
• C. CCK
• D. TSH

Answer 1

The correct option is B

ANF

The correct option is B

Explanation of the correct option:

1. The atrial wall of the human heart secretes ANF or Atrial Natriuretic Factor, which is an essential peptide hormone.
2. This hormone is primarily released in response to the elevation in the volume of blood.
3. The ANF is primarily involved in blood vessel dilation.
4. It diminishes water, sodium, and fatty concentration in the circulatory system, therefore, it reduces blood pressure.

Explanation of the incorrect option:

Option A:

1. 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.
2. ADH also known as vasopressin, is a hormone, which makes the kidneys discharge less water, reducing the concentration of the produced urine.

Option C:

1. CCK or cholecystokinin is a hormone discharged by the upper small intestine’s I-cells in response to protein, fat, and some non-nutrients.
2. CCK performs digestion in the small intestine by preventing gastric emptying, it instigates the acinar cells of the pancreas to discharge a juice rich in pancreatic digestive enzymes, which catalyze the digestion of protein, fat, and carbohydrates.

Option D:

1. TSH or thyroid-stimulating hormone is generated and discharged into the blood by the pituitary gland.
2. It mediates the generation of the thyroid hormones, triiodothyronine, and thyroxine, by the thyroid glands by combining with the receptors situated on the cells in the thyroid gland.

Final answer: ANF is secreted by the atrial walls of the human heart.