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News in Physiological Sciences, Vol 8, 121-124, Copyright © 1993 by International Union of Physiological Sciences
ARTICLES |
M Decramer
Breathing requires a coordinated contraction of different respiratory muscles. During quiet breathing in upright humans, the diaphragm, parasternal intercostals, and scalenes contract and interact to displace the chest wall along its relaxation line. The most important expiratory muscles, triangularis sterni and transversus abdominis, do not contribute to quiet breathing.
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