Question

How much CO does the myocardium receive at rest? What is that in ml/min?

a) 20% of total CO; 70 ml/min
b) 5% of total CO; 250 ml/min
c) 15% of total CO; 150 ml/min
d) 10% of total CO; 300 ml/min

Answer 1

The myocardium receives 10% of the total cardiac output (CO) at rest, which is approximately 525 ml/min.

Step-by-step explanation:

The myocardium, which is the muscular wall of the heart, receives approximately 10% of the total cardiac output (CO) at rest. The total CO of a resting adult is 5.25 L/min on average, so the myocardium receives 10% of that, which is 0.525 L/min. To convert this to ml/min, we multiply by 1000, resulting in 525 ml/min. Therefore, the correct answer is d) 10% of total CO; 300 ml/min.