Question

Which of the following conditions will not contribute in increasing the urine output?
(a) Release of Atrial natriuretic peptide
(b) Reabsorption of sodium ions and water from the distal parts of the tubule in presence of aldosterone.
(c) Release of ADH that facilitate water reabsorption from latter parts of the tubule

Choose the correct option.

• A. Only (a) and (b)
• B. Only (b) and (c)
• C. (a), (b) and (c)
• D. Only (a) and (c)

Answer 1

The correct option is B Only (b) and (c)

ADH or vasopressin facilitates water reabsorption from the latter parts of nephron (DCT and CD), thereby preventing diuresis.
An increase in blood flow to the atria of the heart can cause the release of Atrial Natriuretic Factor (ANF). ANF can cause vasodilation (dilation of blood vessels) and thereby decrease the blood pressure. ANF mechanism, therefore, acts as a check on the renin-angiotensin mechanism.