alveolus gas exchange

navigate by keyword : air alveolar alveoli alveolus anatomical anatomy artery biology blood breath breathe breathing bronchi bronchiole capillary carbon cell closeup deoxygenated diagram dioxide exchange gas health healthy human illustration lung medical medicine molecule organ oxygen oxygenated pulmonary red respiration respiratory sac science system vector vein vessel

Alveolus. gas exchange. Close-up of alveolar sac with blood vessel and red blood cells. vector