Question

Calculate the heart rate of a person if the cardiac output is SL, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50mL.

Options

• 100 beats per minute

• 50 beats per minute

• 75 beats per minute

• 25 beats per minute

Answer 1

100 beats per minute

Explanation:

Stroke Volume (SV) x Heart Rate = Cardiac Output (HR) 5000 mL cardiac output or SL

End-of-diastole blood volume in the ventricles

= lOOmL = lOOmL = lOOmL =

At the end of the systole, the blood volume in the ventricles is measured.

50 milliliters

100 - 50 = 50 mL stroke volume

50 mL x Heart rate = 5000 mL

As a result, the heart rate equals l00 beats per minute.