Multiple choice

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

  1. contract; decrease

  2. expand; increase

  3. contract; increase

  4. contract; release

  5. expand; decrease
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

During inhalation, thoracic cavity expands and the air pressure decreases in the lungs.

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