When you know the heart pumping method in circulatory system, which issue did you remember particularly? What's the reason for that?

Explanation

1) The heart beats faster during and after an exercise remembered by me. Because at that time our body needs more energy under these conditions.
2) The faster breathing of heart pumps blood more rapidly to the body organs.
3) This results in the ample supply of oxygen to the body parts.
4) That is a great job for heart muscle.