Answer:
Alveoli are tiny, balloon-shaped air sacs. Their job is to move oxygen and carbon dioxide (CO2) molecules into and out of your bloodstream.
Explanation:
Answer:
Cellular respiration increases as you increase you exercise intensity. Cellular respiration includes the reactions in the cells of your body when they convert the food you eat into a molecule of energy in a form your cells can use. This energy is called adenosine triphosphate, or ATP.
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