Question

Which of the following is TRUE regarding atrial natriuretic factor (ANF)?

• A. When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels
• B. ANF is a peptide hormone
• C. ANF is secreted by the atrial wall of the heart
• D. All of the above

Answer 1

The correct option is D All of the above

When the blood pressure is increased it results in excess of blood flow to the Heart. When the blood flow to the heart is increased it leads to the stretching of the atrial wall and the release of ANF (Atrial natriuretic polypeptide) from the atrial walls. The ANF is a polypeptide hormone which causes the vasodilation (dilation of blood vessels) and thereby decrease the blood pressure. Hence ANF is a peptide hormone which is secreted by the atrial wall of the heart when blood pressure is increased and causes dilation of the blood vessels which results in the decrease of the blood pressure.

So, the correct option is 'All the above'.