Questions: Multiple Choice Question The is the volume of blood in each ventricle at the end of contraction and the is the volume of blood in each ventricle at the end of relaxation. end-systolic volume; end-diastolic volume stroke volume; end-diastolic volume end-diastolic volume; end-systolic volume end-systolic volume; stroke volume

The answer is the first one: end-systolic volume; end-diastolic volume.

Explanation for each option:

1. end-systolic volume; end-diastolic volume: This is correct. The end-systolic volume (ESV) is the volume of blood remaining in each ventricle at the end of contraction (systole), and the end-diastolic volume (EDV) is the volume of blood in each ventricle at the end of relaxation (diastole).

2. stroke volume; end-diastolic volume: This is incorrect. Stroke volume is the amount of blood ejected from a ventricle during a single heartbeat, not the volume at the end of contraction.

3. end-diastolic volume; end-systolic volume: This is incorrect. The end-diastolic volume is the volume at the end of relaxation, not contraction, and the end-systolic volume is the volume at the end of contraction, not relaxation.

4. end-systolic volume; stroke volume: This is incorrect. While end-systolic volume is correctly identified as the volume at the end of contraction, stroke volume is not the volume at the end of relaxation.

In summary, the correct terms for the volumes at the end of contraction and relaxation are end-systolic volume and end-diastolic volume, respectively.