Question

When compared to human beings elephant is bigger in size. But its rate of heart
beat is lower than humans. Why?
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Answer 1

$\sf \pmb{Answer :}$ \sf \:

The heart rate of a huge size elephant is about 25 beats per minute. So, from this, we can conclude that the larger the size of an organism the slower is the heart rate and smaller the organisms the faster is the heart rate. (ii) This difference in heart rate due to the size makes an importance in the metabolism.