Bio 225 Epithelial Cells

Simple squamous epithelium

• Location: Air sacs of lungs and the lining of the heart, blood vessels, and lymphatic vessels.

• Function: Allows materials to pass through by diffusion and filtration, and secretes lubricating substance.

• **FLAT

Simple cuboidal epithelium

• Location: In ducts and secretory portions of small glands and in kidney tubules.

• Function: Secretes and absorbs.

• **For SECRETION

Simple columnar epithelium

• Location: Ciliated tissues are in bronchi, uterine tubes, and uterus; smooth (nonciliated tissues) are in the digestive tract, bladder.

• Function: Absorbs; also secretes mucus and enzymes.

• **Tall and Skinny

Pseudostratified columnar epithelium

• Location: Ciliated tissue lines the trachea and much of the upper respiratory tract.

• Function: Secretes mucus; ciliated tissue moves mucus.

• One layer, not exactly columnar

Stratified squamous epithelium

• Location: Lines the esophagus, mouth, and vagina.

• Function: Protects against abrasion.

• Flat and layered

Stratified cuboidal epithelium

• Location: Sweat glands, salivary glands, and the mammary glands.

• Function: Protective tissue.

Stratified columnar epithelium

• Location: The male urethra and the ducts of some glands.

• Function: Secretes and protects.

Transitional epithelium

• Location: Lines the bladder, urethra, and the ureters.

• Function: Allows the urinary organs to expand and stretch.