What are alveoil?

Alveoli are small, sac-like structures in the lungs where gas exchange takes place. They are lined with capillaries, which are tiny blood vessels that allow oxygen to pass from the air into the blood, and carbon dioxide to pass from the blood into the air.

Alveoli are found in clusters, and each cluster is called an alveolus. The alveoli are connected to the bronchioles, which are small airways that lead to the larger bronchi. The bronchi lead to the trachea, which is the windpipe.

The walls of the alveoli are very thin, which allows for rapid diffusion of gases. The capillaries that line the alveoli are also very thin, which allows for efficient exchange of oxygen and carbon dioxide.

Alveoli are essential for life, as they allow us to breathe in oxygen and exhale carbon dioxide. Without alveoli, we would not be able to survive.

Here are some additional facts about alveoli:

* There are about 300 million alveoli in the human lungs.

* The total surface area of the alveoli is about 100 square meters (1,076 square feet).

* The alveoli are lined with a type of cell called an epithelial cell.

* The epithelial cells produce a surfactant, which is a substance that helps to keep the alveoli open.

* The alveoli are surrounded by a network of blood vessels.

* The blood vessels in the alveoli are responsible for transporting oxygen and carbon dioxide to and from the lungs.