Question

breathing rate of a person is not always constant. Give reason​

Answer 1

Answer:

Breathing rate of a person is not always constant because it changes according to the oxygen requirement of the body. For example, when you start running, the amount of oxygen required for the body changes according to the speed and time of your movement

Answer 2

Explanation:

The breathing rate of a person is not always constant because while at rest no activity is done by a person and thus less energy is required . Therefore breathing rate is slow.

But while physical activities such as running and physical exercises much more energy is required and therefore the breathing rate of the person is fast.

This is the reason the breathing rate of a person is not always constant.