The walls of the alveoli are composed of two types of cells. Name these two types

The pulmonary alveoli are tiny air sacs, present in the lungs, surrounded by blood capillaries and a thin membrane. They are lined by a layer of epithelial cells, called pneumocyte type I and pneumocyte type II.

Type I pneumocytes are pavement cells with a small amount of cytoplasm. This feature facilitates the passage of gases.

Type II pneumocytes are oval, bulky cells. This type of cell produces a lipoprotein secretion, called a surfactant. Its function is to keep the alveoli open and assist in the diffusion of gases through the alveolar membrane.

Explanation:

Type I and II.

Explanation:

The alveoli are found in the lungs and they helps in taking in oxygen. The alveoli is divided into two types of cells and they the first one is; (1). Type I cell (which covers about 93 - 95 percent of the surface of the aveoli) and (2). Type II cell(which can be used to repair worn our aveoli. The type 1 is used in one of the process alveoli undergoes and that is diffusion that is to say type one helps in gaseous exchange.

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