![alveolus. gas exchange. Close-up of alveolar sac with blood vessel and red blood cells. vector Stock Vector Image & Art - Alamy alveolus. gas exchange. Close-up of alveolar sac with blood vessel and red blood cells. vector Stock Vector Image & Art - Alamy](https://c8.alamy.com/zooms/9/bed84aa233e54d868cdd07c610bcbe60/2h3g8r5.jpg)
alveolus. gas exchange. Close-up of alveolar sac with blood vessel and red blood cells. vector Stock Vector Image & Art - Alamy
![Annotated Illustration of diseased human alveoli. The alveoli are air sacs in the lungs, at the ends of the bronchioles, that allow the exchange of ca Stock Photo - Alamy Annotated Illustration of diseased human alveoli. The alveoli are air sacs in the lungs, at the ends of the bronchioles, that allow the exchange of ca Stock Photo - Alamy](https://c8.alamy.com/comp/2DHN6EN/annotated-illustration-of-diseased-human-alveoli-the-alveoli-are-air-sacs-in-the-lungs-at-the-ends-of-the-bronchioles-that-allow-the-exchange-of-ca-2DHN6EN.jpg)
Annotated Illustration of diseased human alveoli. The alveoli are air sacs in the lungs, at the ends of the bronchioles, that allow the exchange of ca Stock Photo - Alamy
![structures of respiratory zone, alveoli, alveolar duct, alceolar sac, alveolar duct, respiratory bronchioles, termin… | Respiratory system, Pulmonology, Respiratory structures of respiratory zone, alveoli, alveolar duct, alceolar sac, alveolar duct, respiratory bronchioles, termin… | Respiratory system, Pulmonology, Respiratory](https://i.pinimg.com/736x/9f/4b/a1/9f4ba11df2a4806ec51c51b0edf65744--terminal-respiratory-system.jpg)