Which statement is correct regarding breathing?
a. Before inspiration, the pressure inside the chest cavity is higher than atmospheric pressure.
b. During expiration, the intrathoracic pressure rises to allow the air to escape into the atmosphere.
c. When the chest wall moves, the lungs move.
d. During inspiration, the chest wall is com-pressed.
C
When the chest wall moves, so do the lungs because the lungs are attached to the inner wall of the thoracic cavity by the outer layer of the pleura. Before inspiration, the pressure inside the chest cavity is negative. During expiration, the muscles relax, decreasing intrathoracic pressure to allow the air to escape into the atmosphere. During inspiration, the chest wall expands.
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