Stroke Volume is defined as the amount of blood pumped per beat.

Stroke Volume is defined as the amount of blood pumped per beat.

• A. Volume of blood pumped per beat
• B. Amount of blood pumped per beat
• C. Pressure generated by the ventricle
• D. Oxygen content of arterial blood

Answer: (B)

Stroke volume measures how much blood the ventricle ejects with each heartbeat. It is a quantity—the amount (or volume) of blood pumped per beat—so defining it as the amount of blood moved during one contraction is most accurate. The ventricle must generate pressure to push blood out, but that pressure describes force, not how much blood is expelled. Oxygen content of arterial blood pertains to oxygen delivery, not the amount of blood pumped. In healthy adults, stroke volume is about 60–100 mL per beat, and cardiac output equals stroke volume times heart rate, tying the beat-to-beat quantity to minute-wide blood flow.

Stroke volume measures how much blood the ventricle ejects with each heartbeat. It is a quantity—the amount (or volume) of blood pumped per beat—so defining it as the amount of blood moved during one contraction is most accurate. The ventricle must generate pressure to push blood out, but that pressure describes force, not how much blood is expelled. Oxygen content of arterial blood pertains to oxygen delivery, not the amount of blood pumped. In healthy adults, stroke volume is about 60–100 mL per beat, and cardiac output equals stroke volume times heart rate, tying the beat-to-beat quantity to minute-wide blood flow.