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Intercostal muscles


intercostal muscles
The muscles lying between the ribs of vertebrates that, with the ribs, form the walls of the thorax.
internal nares
two small openings in the roof of the buccal cavity.
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The external intercostal muscles contract, lifting the ribs up and out.
The diaphragm contracts, drawing it down .
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In the mammal, a large muscle, the diaphragm (in addition to the internal intercostal muscles), drive ventilation by periodically altering the intra-thoracic volume and pressure; by increasing volume and thus decreasing pressure, ...
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