A single heart beat involves ________ stages.
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
One cardiac cycle has three main stages: atrial systole, ventricular systole, and joint diastole. Students may choose two by counting only the two systolic stages and overlooking the diastolic stage in which all chambers relax.
Last updated