Alveoli in the Lungs

Alveoli are tiny, sac-like structures in the lungs where gas exchange occurs. Located at the end of bronchioles, alveoli are surrounded by a dense network of capillaries. Their thin walls, composed of a single layer of epithelial cells, allow oxygen to diffuse into the bloodstream and carbon dioxide to exit. Alveoli are lined with surfactant, a substance that reduces surface tension and prevents collapse during exhalation. With millions of alveoli in the lungs, they provide a large surface area for efficient gas exchange, which is essential for delivering oxygen to the body and removing waste gases like carbon dioxide. #alveoli #lungs #respiratorysystem