H66 I think oxygen it was that is
Answer:
carry blood away from the heart
Answer:
Cellular respiration is the process of using oxygen in the mitochondria to chemically break down organic molecules such as glucose to release the energy stored in its bonds. In the process molecules of water and carbon dioxide are released as waste products
Explanation:
Your pattern of breathing increases, making it faster than usual, when you're exercising because you're pushing your body to work harder and speeding up your heart rate making you tired.
When you're resting your breathing pattern should be steady and normal since you aren't doing anything that requires lots of body work or something that would make you out of breath.
Hope this helps,
Davinia.