What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the…

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
  1. 50 beats per minute
  2. 75 beats per minute
  3. 100 beats per minute
  4. 125 beats per minute

Solution

CO = HR X (EDV-ESV) (Cardiac Output = Heart rate x stroke volume; stroke volume = End Diastole volume - End Systole volume);
We have, CO = 5 Liters,5000ml
EDV = 100ml
ESV =50 ml
Hence, CO = HR x (EDV - ESV)
HR = CO / (EDV - ESV)
HR = 5000 / (100-50)
= 5000 /50
HR = 100 bpm

Asked in: NEET 2019 (All India)

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