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Inspiration is a process in which the lungs receives air from the extrinsic environment.
The process of gas exchanges involves a number of organs and tissues in the body of certain organisms. However, respiratory muscles as part of the body, are used in gas exchange and chiefly used in inspiration.
Inspiration occurs as a result of muscles contraction (for instance, diaphragm and the external inter-coastal muscles) and thus, increasing the volume of the thoracic cavity, which leads to the decrease in the atmospheric pressure in the lungs to supply air (oxygen) into the body.
In other way round, the relaxation of the these muscles brings about expiration i.e., release of gas out of the body.
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