<P> A pulmonary alveolus ( plural : alveoli , from Latin alveolus , `` little cavity '' ) 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 . Carbon dioxide rich blood is pumped from the rest of the body into the capillaries that surround the alveoli where , through diffusion , carbon dioxide is released and oxygen absorbed . </P>
<P> A pulmonary alveolus ( plural : alveoli , from Latin alveolus , `` little cavity '' ) 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 . Carbon dioxide rich blood is pumped from the rest of the body into the capillaries that surround the alveoli where , through diffusion , carbon dioxide is released and oxygen absorbed . </P>
where is the alveoli located in the human body
where is the alveoli located in the human body
lung parenchyma
lung parenchyma