Question

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. please select the best answer from the choices provided. o a o b o c o d

Explanation:

When exercise levels increase, the body needs more oxygen. The lungs adapt by expanding in size to take in more air and exchange gases more efficiently. Respiratory muscles strengthen, not shrink. The trachea doesn't widen significantly and airways don't narrow as a normal response to increased exercise.

Answer:

B. The lungs expand in size.