![The diagram illustrates the healthy trachea and air sacs of the human lungs highlighted with black lines for easy viewing. 8288533 Vector Art at Vecteezy The diagram illustrates the healthy trachea and air sacs of the human lungs highlighted with black lines for easy viewing. 8288533 Vector Art at Vecteezy](https://static.vecteezy.com/system/resources/previews/008/288/533/original/the-diagram-illustrates-the-healthy-trachea-and-air-sacs-of-the-human-lungs-highlighted-with-black-lines-for-easy-viewing-vector.jpg)
The diagram illustrates the healthy trachea and air sacs of the human lungs highlighted with black lines for easy viewing. 8288533 Vector Art at Vecteezy
Mayo Clinic - Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm
![Illustration of the anatomy of the lungs, with a close-up of the alveoli, the small air sacs at the end of the respiratory tree Stock Photo - Alamy Illustration of the anatomy of the lungs, with a close-up of the alveoli, the small air sacs at the end of the respiratory tree Stock Photo - Alamy](https://c8.alamy.com/comp/G156FA/illustration-of-the-anatomy-of-the-lungs-with-a-close-up-of-the-alveoli-G156FA.jpg)