Question

stroke volume:
○ is the amount of blood pumped by both ventricles per cycle.
○ is the total amount of blood pumped by a single ventricle in one minute
○ is the total amount of blood pumped by the heart in one minute.
○ is the amount of blood pumped by the left ventricle in one cardiac cycle.
○ none of the above.

Explanation:

To determine the correct definition of stroke volume, we analyze each option:

• The first option is incorrect because stroke volume is the blood pumped by a single ventricle (usually the left) per cycle, not both.
• The second option is incorrect as it describes cardiac output (volume per minute), not stroke volume (volume per cycle).
• The third option also describes cardiac output (total per minute by the heart), not stroke volume.
• The fourth option correctly defines stroke volume: the amount of blood pumped by the left ventricle (or a single ventricle) in one cardiac cycle.
• The fifth option is incorrect because the fourth option is correct.

Answer:

D. is the amount of blood pumped by the left ventricle in one cardiac cycle.