Inspiration is initiated by

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(B) Inspiration is initiated by the contraction of the diaphragm,which increases the volume of the thoracic chamber in the antero-posterior axis.The c

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Contraction of the diaphragm

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(B) Inspiration is initiated by the contraction of the diaphragm,which increases the volume of the thoracic chamber in the antero-posterior axis.The contraction of the external intercostal muscles lifts up the ribs and the sternum,causing an increase in the volume of the thoracic chamber in the dorso-ventral axis.The overall increase in the thoracic volume causes a similar increase in the pulmonary volume,leading to a decrease in intrapulmonary pressure,which draws air into the lungs.

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