Question

Short / Long type answer type questions.
The heart rates of an elephant, a human and a mouse are nearly 25, 72 and more than 200 per minute respectively (I) what conclusion can you draw from these observations? (ii) What is the significance of this difference in the heart rates?

Answer 1

1. Animals with larger size like elephants have a slow heart rate than the small organisms like mouse.

2. This is significant for efficient metabolism. The body heat of small-sized animals is rapidly emitted. As a result, it has to burn more calories to maintain the body temperature at a normal level. This requires more oxygen. And to deliver oxygen to the body cells, the animal's heart need to be beat more faster.