The walls of alveoli contain an extensive network of blood vessels. These vessels facilitate the exchange of gases, allowing oxygen from the alveolar air to be absorbed by the blood and transporting carbon dioxide from the blood into the alveoli.
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Blood vessels in the walls of alveoli play a vital role in gas exchange within the respiratory system. These vessels form an extensive network surrounding the alveoli. During inhalation, oxygen from the inhaled air diffuses across the thin alveolar walls into the bloodstream, binding with hemoglobin in red blood cells. Simultaneously, carbon dioxide, a waste product of cellular respiration, diffuses from the blood into the alveoli to be expelled during exhalation. This intricate interaction between the alveoli and blood vessels ensures the efficient exchange of oxygen and carbon dioxide, supporting respiratory function and maintaining blood gas levels in the body.