Answered

As exercise levels increase, which of the following physiological changes occurs?

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.



Answer :

GinnyAnswer

Final answer:

Muscle contraction and volume changes in the thorax are essential in the mechanics of breathing.


Explanation:

In the mechanics of breathing, muscle contraction and volume changes in the thorax play a crucial role. When the diaphragm contracts and the external intercostal muscles expand the thoracic cavity, the volume increases, leading to a decrease in intra-alveolar pressure. This pressure gradient results in air being drawn into the lungs during inspiration.


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the lungs expand in size

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