Eli5 Why do we become out of breath and start breathing heavy if we do something exhausting if we are always breathing air in and out?

Question

I don’t get how we get out of breath if we are breathing air into our lungs all the time.

In: 0

Answer 1

Oxygen is transferred from your lungs to your blood to your whole body.
If we do something exhausting our body parts needs more oxygen so your brain tells your body to breath more/heavy so more air goes into your lung and more oxygen can be transferred from there.