Ciliated columnar epithelial cells are rectangular. They have between 200 to 300 hair-like protrusions known as cilia. The mitochondria are found towards the apical region of the cell. Whereas the cell nuclei are found towards the mostly elongated base.

Cilia are tiny hair like structures on the surface of the cell. The hairs sweep hair, mucus, trapped dust and bacteria up to the back of the throat where it can be swallowed.

Ciliated epithelium performs the function of moving particles or fluid over the epithelial surface in such structures as the trachea, bronchial tubes, and nasal cavities. It often occurs in the vicinity of mucus-secreting goblet cells.

Ciliated columnar epithelium is composed of simple columnar epithelial cells with cilia on their apical surfaces. These epithelial cells are found in the lining of the fallopian tubes and parts of the respiratory system, where the beating of the cilia helps remove particulate matter.

There are eight basic types of epithelium: six of them are identified based on both the number of cells and their shape; two of them are named by the type of cell (squamous) found in them. Epithelial tissue is classified based on the number of cells, the shape of those cells, and the types of those cells.

Simple squamous epithelia are found lining the cavities of the body including the pericardial, pleural, and peritoneal cavities, or in areas where passive diffusion occurs, such as glomeruli in the kidney and alveoli in the respiratory tract.

The covering or protective tissues in the animal body are epithelial tissues. Epithelium covers most organs and cavities within the body. The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue.

Functions

• They form the outer layer of skin.
• Form lining of mouth and alimentary canal,protect these organs.
• Help in absorption of water and nutrients.
• It forms barrier to keep different body system separate.
• Form lining of blood vessels,alveoli,kidney tubules.

Overview and types of epithelial tissue

• Epithelial tissue is classified on the basis of shape, layer and function:
• A. On the Basis of Shape:
• Squamous Epithelial.
• Cuboidal Epithelial.
• Columnar Epithelial.
• B. On the Basis of Layer:
• Simple Epithelial.
• Stratified Epithelial.

Epithelial tissue or epithelium forms the skin’s outer cover that also lines the cavity of the body. It forms the lining of tracts that are respiratory, digestive, reproductive and excretory. They perform different functions including absorption, secretion, sensation, protection and secretion.

Epithelial tissues

• This tissue which has a free surface faces either a body fluid or the outside environment and thus provides a covering or a lining for some part of the body is called epithelial tissues.
• The cells are compactly packed with little intercellular matrix.
• There are two types of epithelial tissues.

Epithelium (/ˌɛpɪˈθiːliəm/) is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.

Epithelial tissue covers body surfaces and lines body cavities. Functions include lining, protecting, and forming glands.