Health, 29.11.2019 11:31 brycehelmke60811

As exercise levels increase, which of the following physiological changes occurs in the respiratory system?
a.
the respiratory muscles shrink.
b.
the lungs expand in size.
c.
the trachea widens.
d.
the airways narrow.

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As exercise levels increase, which of the following physiological changes occurs in the respiratory...