The number of alveoli and alveolar sacs are what give your lungs a spongy consistency. ... The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood. The carbon dioxide you breathe out is diffused from the capillaries to the alveoli, up the bronchial tree and out your mouth.
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The number of alveoli and alveolar sacs are what give your lungs a spongy consistency. ... The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood. The carbon dioxide you breathe out is diffused from the capillaries to the alveoli, up the bronchial tree and out your mouth.