Respuesta :

Answer:

The process of exhalation occurs due to an elastic recoil of the lung tissue which causes a decrease in volume, resulting in increased pressure in comparison to the atmosphere; thus, air rushes out of the airway. There is no contraction of muscles during exhalation; it is considered a passive process.

Explanation:
Answer: what causes exhalation is breathing out you can’t hold CO2 that transfers from the blood into your lungs when the o2 breathed in transfers to the blood so u breathe out that co2

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