what makes up the layer of the alveoli
a thin layer of tissue that covers a surface, lines a cavity, or divides a space or organ. adj., adj memÂ´branous. alveolar-capillary membrane (alveolocapillary membrane) a thin tissue barrier through which gases are exchanged between the alveolar air and the blood in the pulmonary capillaries.Called also blood-air barrier and blood-gas barrier. alveolodental membrane periodontium. arachnoid membrane arachnoid. thin layer of tissue that covers a surface, lines a cavity, or divides a space or organ. adj., adj memÂ´branous. alveolar-capillary membrane (alveolocapillary membrane) a thin tissue barrier through which gases are exchanged between the alveolar air and the blood in the pulmonary capillaries.