Contraction of the intercostal muscles and diaphragm cause the thoracic cavity to ____________ and the air pressure in the lungs to _____________.

Contraction of the intercostal muscles and diaphragm cause the thoracic cavity to ____________ and the air pressure in the lungs to _____________.

  1. A

    expand; decrease

  2. B

    expand; increase

  3. C

    contract; increase

  4. D

    contract; decrease

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