Question

In a cardiac cycle, if the stroke volume is $70{\text{ }}ml$ and heart rate is $72{\text{ }}beats/min$ , the cardiac output is
A) $142{\text{ }}ml/min$
B) $72{\text{ }}ml/min$
C) $1070{\text{ }}ml/min$
D) $70{\text{ }}ml/min$
E) $5040{\text{ }}ml/min$

Answer 1

In a healthy heart, all movements and rest are triggered and coordinated during each human cardiac rhythm or heartbeat by signals from the electrical conduction system of the heart, and that is the "wiring" of the heart that brings electrical impulses across the cardiomyocyte body, the complex muscle cells of the heart.

Complete answer:
The cardiac cycle is the human heart's activity from the end of a heartbeat to the starting of the next. It comprises two periods:- one in which, after a period of robust contraction and blood pumping, the heart muscle relieves and refills with blood, named diastole, nicknamed systole. After flushing, the heart then relaxes and opens to accept another supply of blood coming from the lungs and other structures of the body, again before pressing to deliver blood to the lungs and certain structures.
Now, let us find the solution from the options-
- Cardiac output is described as the blood per minute pumped into the aorta by the left ventricle or from the right ventricle into the pulmonary artery.
Cardiac performance is measured as: volume of stroke x heart rate
Stroke volume is specified 70 ml in the question and heart rate is specified $72{\text{ }}beats/min$
Thus, cardiac output =$70 \times 72 = {\text{5040 ml/min}}$

Thus, the correct answer is option (E) ${\text{5040 ml/min}}$.

Note: A sequence of electrical impulses generated by advanced pacemaker cells located inside the sinoatrial node and the atrioventricular node coordinate cardiac muscle movements.