The interchange of gases in the lungs

Oxygen and carbon dioxide exchange is the primary function of the respiratory system. Oxygen is needed by every cell of the body and delivery is accomplished by way of the bloodstream. The respiratory and circulatory systems, therefore, both participate in this process. The interchange of gases in the lungs involves the absorption of oxygen from the air in exchange for carbon dioxide which is released by the body as a waste product of cell metabolism.

Inhaled and exhaled air

Superior vena cava

Aorta

Right lung

Capillaries

Capillaries

O Oxygen (OJ Q Carbon dioxide (CO2)

Red blood cells

Inhaled and exhaled air

Superior vena cava

Aorta

Right lung

Trachea Left lung

Pulmonary artery Pulmonary vein Heart

Fig 7.3 The interchange of gases

O Oxygen (OJ Q Carbon dioxide (CO2)

Red blood cells

Trachea Left lung

Pulmonary artery Pulmonary vein Heart

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