Contraction of the scalenus muscles depresses the ribs

Reference no: EM133651794

Question

The diaphragm is one of the principal muscles of expiration and its dome descends as it contracts. Contraction of the parasternal intercartilageneous muscles leads to expiration. Contraction of the abdominal muscles leads to expiration because they push the diaphragm upwards. Contraction of the scalenus muscles depresses the ribs. Airway smooth muscle is under voluntary control.

Reference no: EM133651794

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