McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test

1. Review the animation and answer the following questions.

The mechanism behind breathing involves

A. changing the pressure in the thoracic cavity to change the volume.
B. using the intercostal muscles to push air into the lungs.
C. filling the diaphragm with air.
D. changing the volume of the thoracic cavity to change the pressure.

2. All of the following are required to breathe in EXCEPT A. contraction of the intercostal muscles.
B. increasing the volume of the thoracic cavity.
C. contraction of the lungs.
D. contraction of the diaphragm.

3. When the volume of the thoracic cavity increases, the lungs expand, and air enters. What stops this process? A. The intercostal muscles contract.
B. The pressure of the air inside the lungs and outside the body reach equilibrium.
C. The diaphragm relaxes.
D. The ribs descend.

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