Differentiate inhalation from exhalation based on the movement of the diapragm, chest cavity and ribs.
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The ribs and sternum move downwards and inward as a result of the relaxation of intercostal muscles. During inhalation, the volume of the thoracic cavity increases. During exhalation, the volume of the thoracic cavity decreases. The size of the lungs increases during inhalation.
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