The chief muscle of respiration is (he)
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Adi S.
We breathe primarily by using muscles that enclose the thoracic cavity. These muscles include the diaphragm, the innermost muscles, and the internal and external intercostal muscles. The diaphragm is a muscular sheet between the thoracic and abdominal cavities and is a prime mover of inspiration. The internal intercostals elevate the ribs and expand the thoracic cavity during inspiration. The external intercostals flex the ribs causing a partial vaccuum effect resulting in an influx of air.
The prime mover of inspiration is the (a) diaphragm, (b) internal intercostals, (c) external intercostals, (d) abdominal wall muscles.
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