At the doctor's office, you may have noticed that when you are asked to "breathe deeply," your chest rises and falls and expands more dramatically than when you are breathing normally. Why?

Question

Quizplus · Accepted Answer

When you are asked to breathe deeply, your intercostal muscles are activated to expand your chest cavity. These muscles are located between the ribs and help to increase the space in the chest, allowing for more air to enter the lungs. This is why you may notice your chest rising and expanding more dramatically than when you are breathing normally. The other options mentioned, such as air sacs, spiracles, and bronchioles, are not directly involved in the expansion of the chest during deep breathing.

At the Doctor's Office, You May Have Noticed That When