Question

In response to increased returns of venous blood in the heart, ................ hormone is secreted from ..................

• A. ADH from kidney
• B. ANF from heart
• C. Epinephrine from adrenal medulla
• D. Nor-adrenaline from adrenal medulla.

Answer 1

Answer: (B)

ANF from heart

When there is increased venous return to the heart, the heart needs to pump more blood it leads to stretch in heart walls. In response to the stretch, the heart wall releases ANF into the blood circulation.ANF binds to ANF Receptor -Antagonist. Binding causes the increase in renal sodium excretion, which results in a decreased ECF and blood volume. Hence In response to increased returns of venous blood in the heart, the ANF hormone is secreted from the heart.

So, the correct answer is 'ANF from Heart'.