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#alveoli #microscopic anatomy #histology #sacs #tiny structures

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#alveoli #gas exchange #capillaries #respiration #air sacs #oxygen exchange #doolb

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#lung #deflated #collapse #alveoli #no air #breathing problem #atelectasis #deflated balloon #pulmonary

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#alveoli #breathing #respiration #gas exchange #human anatomy #pulmonary alveolus

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#alveoli #lungs #breathing #gas exchange #respiration #doolb #respiratory system