Question

Why does the rate of heartbeat increase after heavy exercise ?​

Answer 1

Answer:

our heart rate increases because

Explanation:

while doing exercise our muscles need more oxygen which is carried by blood so our heart pumps the blood faster and thus results in increasing heart rate

Answer 2

Answer:

when we do exercise we consume our most of the energy so our body have to produce more energy, to produce more energy it undergoes respiration where it have to take more O2 thus our breathing increases then the O2 goes to the muscles with the help of blood thus our heartbeat increases to supply O2 instantly