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rebreathing from a closed bag results in arterial hypercapnia (raised partial pressure of carbon dioxide), which stimulates respiration. how was this evident in this exercise? (that is, did the depth or rate or both increase during rebreathing compared to normal breathing?)

Answer :

Both rate and depth decreased stimulates respiration was this evident in this exercise.

What is importance of respiration?

Living things must breathe in order to survive. Energy from the food is released. Glucose is broken down into carbon dioxide and water using the oxygen we breathe in. In the process, energy is released.

Why is it referred to as respiration?

Oxygen is not necessary for cellular respiration to function. However, in essence, the procedure is known as "cellular respiration" because it appears that the cell "respires" in a way that involves consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).

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