The four main functions of epithelial tissue are to provide physical protection, control permeablility, provide sensations, and to produce specailized secretions. There are eight types of epithelium.
Simple squamous epithelium - found lining heart and blood vesses, lungs etc. the function is to reduce friction and to absorb and secrete.
Stratified squamous epithelium - found on the surface of the skin and all openings to the body. The function is physical protection against abrasions and pathogens.
Simple cuboidal epithelium - found in glands and ducts. The function is secretion and absorption.
Stratified cuboidal epithelium - found lining some ducts it is rare. Its functions are to protect, secrete, and absorb.
Transitional epithelium - found in the bladder and ureters. The function is to allow expansion and relaxation after stretching.
Simple columnar epithelium - found in the lining of stomach, intestine, and gallbaldder. The functions are protection, secretion and absorption.
Pseudostratified ciliated columnar epithelium - found in the lining of the nasal cavity, trachea, and bronchi. The function is protection and secretion.
Stratified columnar epithelium- found in the pharynx, epiglottis, anus, and urethra. Its function is protection.
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