The alveoli (air sacs) are surrounded by a network of : (A) Ribs (B) Bronchioles (C) Capillaries (D) Trachea
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capillaries.
these help efficient transfer of carbon dioxide and oxygen from and to the blood from alveoli due to their thin walls.
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● The alveoli (air sacs) are surrounded by a network of Capillaries.
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