Air enters the body and warms as it travels through the nose and mouth. , Pharynx, Larynx, Trachea , Bronchus, bronchioles, Alveoli, Gaseous exchange in the lungs. The transfer of oxygen into the blood is through simple diffusion, capillaries , Oxygenated blood circulated from the lungs to the heart, Pulmonary vein enters left atrium, moves to left ventricle, Circulated to body via aorta, arteries, arterioles, capillaries, Oxygen reaches the cells.

Passage of Air into to the body

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