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Inspiratory muscles and expiratory muscles play very important role in respiratory process. |
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Answer» The contraction of the external inter costal muscles and diaphragm leads to increase in volume of thoracic cavity. An increase in pulmonary volume decreases the intra-pulmonary pressure to less than atmospheric pressure. Thus forcing air into the lungs from outside. This is inspiration. Relaxation of the diaphragm and the inter-costal muscles returns the diaphragm and the sternum to their normal positions and reduce the thoracic volume and thereby the pulmonary volume. This lead to an increase in intra-pulmonary pressure in comparison to the atmospheric pressure. This causes expiration. |
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