Answer:
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:
Answer:
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.
