Briefly explain how exchange of gases takes place within lungs?

Once air is within the lungs the process of gaseous exchange begins. Capillaries of the pulmonary artery remain closer to the wall of the alveoli. This enhances the exchange of gases. Oxygen and carbon dioxide are exchanged across the alveolar member by diffusion from the site of higher to lower partial pressure until the partial pressure of the two regions is equal. This process is a simple physical one, which __________ ________ _______ _________ _______.
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