What is the structure of the lungs? How are the structural features of the lungs related to the functions they perform?

The lungs are voluminous sacs consisting of alveoli – vesicles with thin walls, braided by capillaries. The structure of the lungs is directly related to the breathing function they perform. When the lungs are filled with oxygen during inhalation, it freely penetrates the capillaries through the thin walls of the alveoli and spreads throughout the body with the blood stream, while carbon dioxide from the circulatory system enters the alveoli and is released during exhalation.

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