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NEET2019ZoologyBody Fluids and CirculationActual

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?

Options

  1. A50 beats per minute
  2. B75 beats per minute
  3. C100 beats per minute
  4. D125 beats per minute

Correct answer

C. 100 beats per minute

Step-by-step 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

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