ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the volume of blood pumped by either ventricle during one second.
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the stroke volume times the number of beats per hour.
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the stroke volume times the beats per minute.
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the volume of blood in the body divided by the stroke volume.
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Detailed explanation-1: -Cardiac output is the product of heart rate (HR) and stroke volume (SV) and is measured in liters per minute. HR is most commonly defined as the number of times the heart beats in one minute. SV is the volume of blood ejected during ventricular contraction or for each stroke of the heart.
Detailed explanation-2: -Cardiac output = heart rate x stroke volume The equation can be rearranged to find the heart rate and stroke volume if required: Heart rate = cardiac output ÷ stroke volume. Stroke volume = cardiac output ÷ heart rate.
Detailed explanation-3: -Stroke volume is the amount of blood ejected from the ventricle with each cardiac cycle. It can be readily calculated by subtracting the end-systolic volume from the end-diastolic volume. Multiplying the stroke volume by the heart rate yields the cardiac output, typically reported in liters per minute.
Detailed explanation-4: -Your stroke volume is the amount of blood your heart pumps each time it beats, and your heart rate is the number of times your heart beats per minute. During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself.
Detailed explanation-5: -Cardiac Output = Stroke Volume x Heart Rate Because stroke volume is measured in mL per heartbeat and heart rate is defined as beats per minute, beats cancel out through multiplication, and the remaining unit for cardiac output is expressed as mL per minute.