Question

Select all options that apply regarding atrial natriuretic peptide?

(a) It is a hormone

(b) It is synthesized in the kidneys

(c) Its rate of secretion increases when plasma osmolarity increases

(d) It increases Na⁺ excretion by the kidneys

(e) It does not affect water excretion by the kidneys

Answer 1

Ans:-

A, C and D are correct regarding atrial natriuretic peptide.

- Atrial natriuretic peptide is a cardiac hormone that is secreted by the cardiac muscle cells in the walls of the atria in the heart.

- Atrial natriuretic peptide hormone is secreted more when their is increased plasma osmolarity to maintain sodium level in the body as we know increased plasma osmolarity means their is more sodium particles in the serum and ANP inhibits the absorption of sodium and water from kidneys and allows more excretion of sodium and water from the body.

- It affects water excretion by the kidneys by inhibiting its absorption from kidney tubules.