What Are the Functions of Epithelial Cells?

By Beth Celli

Epithelial cells join together to form epithelial membranes or tissue. At times called the epithelium, these sheets cover the outer surface of the body, helping create the form the body, as well as line body cavities. The primary job of epithelial tissue is to protect, but it is also involved in filtration, secretion, and absorption.

Epithelial cells join together to form epithelial membranes or tissue. At times called the epithelium, these sheets cover the outer surface of the body, helping create the form the body, as well as line body cavities. The primary job of epithelial tissue is to protect, but it is also involved in filtration, secretion, and absorption.

Types of Membranes

Epithelial membranes are classified as either cutaneous, meaning the skin, mucous, or serous. Mucous membranes, which line all cavities that are open to the outside, include the digestive and respiratory tract. Serous membranes, which are not open to the outside of the body, line the abdominal and thoracic cavities.

Protection

The skin, which is composed of epithelial cells, protects the body from invasion of germs, as well as from the sunlight.

Filtration

Epithelium of the respiratory tract protects the body by filtering out dirt and particles and cleaning the air that is inhaled.

Secretion

Epithelial cells form glands of the body. These glands secrete hormones and enzymes. Epithelium also may secrete wax, perspiration, digestive enzymes, and milk.

Absorption

The organs of the digestive tract have an abundance of epithelial cells, which function to absorb water and digested food. These cells play a large part in the proper digestion of food.

References

About the Author

Beth Celli is a native New Yorker who is now based in Delaware. She has a varied background in both health care and education, having worked in several different hospitals and medical centers prior to teaching allied health classes. She attended New York University and her writing has appeared on various online publications.

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