Question

What would be the heart rate of a person if the cardiac output is 5L blood volume in the ventricles at the end of diastole is 100mL and at the end of ventricular systole is 50 mL ?

Answer 1

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For example, the ventricle of a 70 kg person at rest might hold about 100 ml of blood at the end of diastole. As noted above, a typical stroke volume is about 70 ml. Thus, the person's ejection fraction is 70%.

Answer 2

Given,

Cardiac output = 5L

Diastole volume = 100 mL

Systole volume = 50 mL

Heart rate = ?

we know,

Cardiac output = Heart rate × Stroke volume.

so, first of all we have to find out Stroke volume.

Stroke volume = End Diastole volume - End systole volume

stroke volume = 100mL - 50mL

= 50 mL

Now,

Cardiac output = Heart rate × stroke volume

(5 × 1000)mL = Heart rate × 50mL

Heart rate = 5 × 1000 / 50

Heart rate = 100 beats/ min

so, the heart rate will be 100 times/ min