![]() The contraction of these muscles increases the volume of the chest cavity, lowering the pressure inside. Inspiration (breathing in) occurs when the muscles of the diaphragm and chest wall contract. Ventilation is the process of moving gases through the respiratory tract. ![]() The blood then circulates back to the lung, where the process begins again. Oxygen then diffuses into the cells, and carbon dioxide enters the blood. The second half of respiration occurs when the blood reaches the tissues. Carbon dioxide exits from the blood into the alveolar air. ![]() Respiration includes gas exchange in the lungs, circulation of gases through the blood stream, and transfer of gases at the cellular level.Īir is drawn into the air sacs of the lungs, where oxygen from the air can enter the blood. ![]() Respiration is the total process of delivering oxygen to the cells and carrying away the byproduct of metabolism, carbon dioxide. ![]()
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