Epithelial Tissue

Simple Squamous
found in the lungs, lining of heart and blood vessels, kidney, and external covering around the organs; function: it's thin so it allows for easy diffusion and filtration. Also reduces friction.
Simple Cuboidal
found in the ducts, kidney tubules, glands; function: secretion and absorption
Simple Columnar
found in the digestive system and larger ducts; function: secretion and absorption
Pseudostratified Columnar
found in the nasal cavity, trachea, bronchi, and portions of the male reproductive tract; function: protection and secretion
Stratified Squamous
surface of skin; found in the lining of mouth, throat, esophagus, rectum, anus and vagina; function: provides physical protection against abrasion, pahtogens, and chemical attack.
Stratified Cuboidal
found in the lining of some ducts (rare); function: protection, secretion and absorption
Stratified Columnar
found in small areas of the pharynx, epiglottis, anus, mammary gland, salivary ducts and urethra; funtion: protection
found in the urinary bladder, renal pelvis and ureters; function: permits expansion and recoil after stretching.

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.