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breathing
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diaphragm; breathing
Understanding the mechanics of human respiration
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Male muscle, man flexing arm, bicep curl.
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Muscles of facial expression, human anatomy, (Netter replacement project - SSC). Human face, human head.
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breathing

physiology
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breathing, the action of moving air or water across the surface of a respiratory structure, such as a gill or lung, to facilitate respiration (the exchange of oxygen and carbon dioxide with the environment). See respiration.