Question

Atrial natriuretic factor (ANF) decreases
(a) blood pressure.
(b) secretion of renin.
(c) Na+ secretion.
(d) vasodilation.

Answer 1

Hint: This factor is secreted by cardiac muscle cells in the walls of the atria in the heart. Its main function is to stretch the wall of the atrium to increase its volume, to ensure the flow of blood occurs easily without any pressure.

Complete answer:
Atrial natriuretic factor (ANF) decreases blood pressure. In humans, Atrial natriuretic peptide (ANP) also known as an atrial natriuretic factor (ANF) is definitely a natriuretic peptide hormone secreted from the cardiac atria that are encoded by the NPPA gene, a protein- coding gene. Natriuretic peptides such as ANP, BNP, and CNP are a family of hormone or paracrine factors that are structurally related. The main function of ANP is causing a discount in expanded ECF (ECF) volume by increasing renal sodium excretion. ANP is synthesized and secreted by cardiac muscle cells in the walls of the atria in the heart. These cells contain volume receptors that respond to increased stretching of the atrial wall due to increased arterial blood volume. secondary effects such as reduction of extracellular fluid (ECF) volume, improved cardiac ejection fraction with resultant improved organ perfusion, decreased blood pressure, and increased serum potassium.
Atrial natriuretic factor (ANF) may be a 28 amino alkanoic acid polypeptide hormone secreted mainly by the guts atria in response to atrial stretch. ANF acts on the kidney to extend sodium excretion and GFR, to antagonize renal vasoconstriction, and to inhibit renin secretion.
Atrial natriuretic peptide (ANP) is a cardiac hormone that regulates salt- water balance and blood pressure by promoting renal sodium and water excretion and stimulating vasodilation. ANP also has an anti-hypertrophic function in the heart, which is independent of its systemic blood pressure- lowering effect.
So, the correct answer is ’blood pressure’.

Note:
- In addition to its role in promoting natriuresis, diuresis, and vasodilation, ANP also regulates cardiac function, vascular remodeling, and energy metabolism. These functions are of significant importance in maintaining cardiovascular and metabolic homeostasis.
- Atrial natriuretic peptide or factor is a hormone that regulates salt- water balance.
- It acts in the heart to prevent cardiac hypertrophy and regulates vascular remodeling and energy metabolism.