Question

The heart has a role in osmoregulation in that it

A. produces angiotensinogen, which is cleaved by renin to produce angiotensin I

B. secretes atrial natriuretic peptide (ANP) in response to increased venous pressure, and ANP reduces sodium retention by the kidneys

C. secretes renin in response to decreased venous pressure, and renin converts angiotensinogen to angiotensin I, leading to a rise in blood pressure and increased rate of filtration at the kidney

D. produces ACE inhibitors, which are profitable for pharmaceutical companies

E. produces aniotensin converting enzyme (ACE), which converts angiotensin I to angiotensin II

Please help, this question confused me so much!

Answer 1

Answer ; B) secretes atrial natriuretic peptide ( ANP ) is response to increased venous pressure and ANP reduces sodium retention by the kidney.

Reason ; The only major hormone that is secreted in the heart and suppress the high peak of the blood pressure is the above mentioned hormone. this hormone has the major role in the kidney on sodium retention for the pressure control. other types of hormone mentioned in the other options are not even secreted in the heart, Therefore above mentioned hormone and its role is the appropriate to the heart physiology.