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  4. The contraction of the diaphragm during inhalation

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Q. The contraction of the diaphragm during inhalation

NTA AbhyasNTA Abhyas 2022

Solution:

Inspiration is initiated by the contraction of diaphragm which increases the volume of the thoracic chamber in the anteroposterior axis. The contraction of 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.
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