Question

Given a heartbeat rate of 72 per minute and an ejection tion of the left ventricle equals 60%. If 100ml of blood enters the left ventricle during each cardiac cycle, which of the following would be true?

a) Stroke volume is 60ml
b) Cardiac output is 120ml
c) Stroke volume is 40ml
d) Cardiac output is 6000ml

Answer 1

The stroke volume is 60ml and the cardiac output is 4320ml per minute.

Step-by-step explanation:

The stroke volume is the amount of blood pumped out of the left ventricle with each heartbeat. It is calculated by subtracting the end-systolic volume (ESV) from the end-diastolic volume (EDV). In this case, the EDV is 100ml and the ejection fraction is 60%, so the stroke volume would be 100ml * 0.6 = 60ml.

Cardiac output is the volume of blood pumped by the heart in one minute and is calculated by multiplying the stroke volume by the heart rate. In this case, the heart rate is given as 72 beats per minute. So, the cardiac output would be 60ml * 72 beats per minute = 4320ml per minute.