Question

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If the cardiac output is 4900 mL and blood volume in
the ventricles at the end of diastole is 140 mL while at
the end of ventricular systole is 70 mL. What would be
the heart rate of this person?
75 beats per minute
70 beats per minute
35 beats per minute
140 beats per minute​

Answer 1

Answer:

2nd option

Explanation:

Answer 2

Answer:

Cardiac output = stroke volume × Heart rate

 Cardiac output = 4900ml

 Blood volume in ventricles at the end of diastole = 140 ml

 Blood volume in ventricles at the end of systole = 70 ml

Stroke volume = 140 - 70

= 70 ml.

So,

4900 ml = 70 ml × Heart rate

So, Heart rate = 70 beats per minute.