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Intercostal Muscles

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Subject: 
Biology
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Respiration
Medical Subject Headings
Muscles of the torso
Medical classification
Torso
Respiratory physiology
Intercostal muscle
Exhalation
Muscles of respiration
Internal intercostal muscles
Lung
Inhalation

INTERCOSTAL MUSCLES Inhalation and exhalation make up 1 breath Internal intercostal muscles External intercostal muscles Sternum Inhalation ? Also termed inspiration ? Diaphragm contracts and flattens. ? Internal intercostal muscles relaxes ? While the external intercostal muscles contract ? The rib cage moves up and out. ? Enlarging the thoracic cavity and decreases the air pressure within. ? Air from the surrounding enters the lungs Exhalation ? Also termed expiration ? Diaphragm relaxes and arch upwards. ? Internal intercostal muscles contracts ? While the external intercostal muscles relaxes ? The rib cage moves down and in. ? Air is forced out of the lungs Summary

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