Question

The increase in blood flow to heart stimulates the secretion of
A. Renin
B. Oxytocin
C. Antidiuretic hormone
D. Atrial natriuretic factor

Answer 1

Hint: The blood flow to heart increases because of a decrease in vascular resistance. Due to which the dilation of arteries and arterioles results in an immediate decrease in the blood pressure and heart rate.

Complete step-by-step answer:
- Renin: It is the enzymes secreted by the kidneys. It is an aspartic protease protein and is also known as angiotensinogen. It helps to regulate the volume of extracellular fluids and arterial vasoconstriction.
- Oxytocin: It is a hormone which is secreted by the posterior lobe of the pituitary gland which is a pea-shaped structure located at the base of the brain. It is also known as the love hormone. It is a peptide and neuropeptide hormone. It plays a role in social bonding, childbirth and the time after childbirth.
- Antidiuretic hormone: It is the hormones prepared by the hypothalamus in the brain and are stored in the posterior part of the pituitary gland. It always controls and balances the quantity of water in the blood. Vasopressin is the antidiuretic hormone.
- Atrial natriuretic factor: It is the hormone that is secreted by the atria of the heart in response to atrial stretch. It is a 28 amino acid polypeptide hormone. It is a protein hormone which is secreted by the atrial wall of the heart in response to increase the flow of blood to the heart and increase in the blood pressure.
Hence, the correct option is D.

Note: Atrial natriuretic factors play a role in the kidney to increase the excretion of sodium. It also hampers the secretion of renin.