Air Into the Lungs. Lungs and Respiratory Tree Lungs and Pleural Cavity Diaphragm Costal muscles Lung Volume and Respiratory Control. Alveoli reminder—this is where the action is!. Key to lung function Where O2 enters blood, CO2 leaves blood Every alveoli is capillary covered sac
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But how does air get to alveoli?
Diaphragm can only actively contract inferiorly to expand thoracic cavity. Exhalation of air from lungs is due to elastic tissue in lungs and compression of abdomen by abdominal muscles
During running, in humans and quadrupedal mammals, the large, heavy liver, moves cranially and caudally, due to rhythmic momentum changes as the feet hit the ground. This in turn pushes and pulls on the diaphragm, thereby expanding and contracting the thoracic cavity with little muscular action on the part of the diaphragm itself.
Lung Volume and Respiratory Rate (review)