The 2 principle factors that determine Cardiac Output are: A. Heart Rate & Blood Volume B....

The 2 principle factors that determine Cardiac Output are:

A. Heart Rate & Blood Volume

B. End Diastolic Volume & End Systolic Volume

C. Heart Rate & Blood Pressure

D. Stroke Volume & Blood Volume

E. Stroke Volume & Heart Rate

Solutions

Expert Solution

Option 'E' (Stroke Volume & Heart Rate) is correct

Justification: Cardiac output is the amount of blood that the heart pumps through circulatory system in one minute and it is influenced by the stroke volume and the heart rate. Stroke volume is the volume of blood pumped from the left ventricle per beat. Heart rate is the speed of heartbeat measured by the number of contractions of heart per one minute and the formula for cardiac output is:

CO = SV × HR

(CO = Cardiac Output; SV = Stroke Volume; HR = Heart Rate)

Justification for incorrect options:

Option 'A' is incorrect because cardiac output is determined by stroke volume and heart rate but NOT by the blood volume.
Option 'B' is incorrect because end-diastolic volume and end-systolic volume are used to determine the stroke volume but not the cardiac output.
Option 'C' is incorrect because cardiac output is not determined by the blood pressure.
Option 'D' is incorrect because cardiac output is determined by stroke volume and heart rate but not by the blood volume.

Thank you!

Sydney Mullin answered 10 months ago

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