5.
muscles contract when the
external intercostal muscles contract
a. Internal abdominal
b. Jaw
c. Muscles in bronchial walls
d. Diaphragm
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the internal intercostal muscles relax and the external intercostal muscles contract, pulling the ribcage upwards and outwards. the diaphragm contracts, pulling downwards. lung volume increases and the air pressure inside decreases. air is pushed into the lungs.
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