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Title: Hwk Help!!! Post by: 7-7 on Nov 6, 2010 During the movements of ventilation, contraction of the diaphragm muscle causes the thoracic cavity to ____________.
Title: Re: Hwk Help!!! Post by: bio_man on Nov 6, 2010 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.
Title: Re: Hwk Help!!! Post by: shamsaur on Jan 4, 2011 Contraction of diaphragm > diaphragm moves downward > enlarging the thoracic cavity > lowers air pressure in lungs > air moves into lungs.
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