Question

if our breathing rate increases why does our heart beat increase too​

Answer 1

Answer:

Your heart rate is actually tied in to your breathing rate in a phenomenon called "respiratory sinus arrythmia (RSA)". When you normally breathe in (inhalation), your heart rate increases slightly and then decreases again when you breathe out (exhalation).

Answer 2

Answer:

to maintain the the need of blood and water and oxygen and glucose to our body and increase the flow of blood