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In order for air to enter the lungs during inhalation, there must be a decrease in pressure so that the pressure inside the thoracic cavity is less than the atmospheric pressure.

Which of the following changes would cause a decrease in pressure within the thoracic cavity? Select ALL that apply.

A

Relaxation of the diaphragm.

B

Relaxation of the external intercostal muscles.

C

Contraction of the diaphragm.

D

Contraction of the external intercostal muscles.

E

Contraction of the abdominal muscles.

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