Cardiodynamics and Cardiac Output

Question 1

ANP and BNP

Answer 1

Name: Atrial natriuretic Peptide and Brain (b-type) natriuretic peptide (BNP)

released by stimulus: excess ‘stress’ (stretch) or pressure in walls of heart eg in cardiac failure

effect:
1. natriuresis
2. vasodilation
3. inhibit renin activation
natriuresis – sodium in urine, water follows, blood volume decreases, reduced venous return, reduced preload