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Question

How many double circulations are normally completed by the human heart in one minute? 


  1. Sixteen

  2. Eight

  3. Thirty six

  4. Seventy two


Solution

The correct option is D

Seventy two


The heart beats about 72 times per minute in mammals because of double circulation.  

Oxygenated blood is pumped out through the left ventricle, while deoxygenated blood is pumped out through the right ventricle.  

There is complete separation of oxygenated and deoxygenated blood in case of complete double circulation. This provides better efficiency to the organism in terms of energy generation. 

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