Explain the mechanics of respiration.

Respiration is the process through which the body exchanges gases, primarily oxygen and carbon dioxide, between the environment and the cells. The mechanics of respiration involve several key steps, primarily divided into two phases: inspiration (inhalation) and expiration (exhalation).

During inspiration, the diaphragm, a dome-shaped muscle below the lungs, contracts and moves downward. This action increases the volume of the thoracic cavity, lowering the air ___ ______ _______ ___ __________ ____ ____.
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