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Why are the alve­oli so im­por­tant?

The tini­est hol­low cav­i­ties in our lungs are known as alve­oli. Their walls are so thin that oxy­gen can en­ter into the blood from the lungs, and vice versa for car­bon diox­ide. One lung con­tains

ALVE­OLI Ap­pear­ance: Lo­cated in groups and look like grape bunches. Size: The di­am­e­ter of one alve­ole is ap­prox­i­mately 0.2 mm.

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