Ventilation is the first stage of Respiratory cycle followed by external respiration, internal transport and internal respiration, Ventilation has two components inspiration and expiration. The transportation of air from in and out of the lungs. The air movement is driven by changes in the pressure within the thoracic cavity, during inspiration pressure inside the cavity decreases below that of the outside air causing air to follow in to the lungs and expand the size of thoracic cage.
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