Question

c)
Explain why our heart rate increases when we are exercising?​

Answer 1

Our heart rate increases when we are exercising because our muscle cells need double amount of oxygen in order to release energy. it it also beats fast so that the blood circulation is more.

Hope it helps!

Swara

Answer 2

Answer:

our heart rate increases when we are exercising because during exercise we need 3 or more times the normal heart rate because our muscles need more oxygen then blood can flow whole of our body that's why heart rate increases during exercise