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What is Alveoli in Biology? PDF | Download eBooks

Learn Alveoli definition in biology with explanation to study “What is Alveoli”. Study alveoli explanation with biology terms to review biology course for online degree programs.

Alveoli Definition

  • Air sacs are small pouches of air clustered at the tips of the tiniest bronchioles.

    Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson



Alveoli Explanation

The pulmonary alveolus , which are also called alveoli, is a hollow cavity found in the lung parenchyma, and is the basic unit of ventilation. Lung alveoli are the ends of the respiratory tree, branching from either alveolar sacs or alveolar ducts, which like alveoli are both sites of gas exchange with the blood as well. Alveoli are particular to mammalian lungs. Different structures are involved in gas exchange in other vertebrates. The alveolar membrane is the gas exchange surface.

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