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7-7 7-7
wrote...
13 years ago
During the movements of ventilation, contraction of the diaphragm muscle causes the thoracic cavity to ____________.
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#1
Educator
13 years ago
Contraction of the diaphragm expels air from the lungs rather than drawing air in. When the intercostal muscles and the diaphragm contract they increase the size of the thoracic cavity, causing negative pressure in the lungs, causing inspiration.
shamsaur Author
wrote...
#2
13 years ago
Contraction of diaphragm > diaphragm moves downward > enlarging the thoracic cavity > lowers air pressure in lungs > air moves into lungs.
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