22. The Respiratory System
Introduction to Lung Physiology
Multiple Choice
Multiple ChoiceVentilation occurs when:
A
Muscles cause the volume of the thoracic cavity to change.
B
The gas molecules pass between air and the blood.
C
Changes in pressure cause a change in the size of the thoracic cavity.
D
The lungs contract and relax, altering the size of the thoracic cavity.
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