A&P Chapter 4: Epithelial tissues

Simple squamous function

Allows materials to pass by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae (in ventral body cavity)

Simple squamous location

Kidney glomeruli; air sacs of the lungs; lining of heart, blood vessels and lymphatic vessels; lining of ventral body cavity (serosae)

Simple cuboidal function

secretion and absorption

Simple cuboidal location

Kidney tubules; ducts and secretory portions of small glands; ovary surface

Simple columnar function

absorption; secretion of mucus, enzymes, and other substances; ciliated type propels mucus (or reproductive cells) by ciliary action

Simple columnar location

Nonciliated type lines most of the digestive tract (stomach to anal canal), gallbladder, and excretory ducts of some glands; ciliated variety lines small bronchi, uterine tubes, and some regions of the uterus

Pseudo stratified columnar function

secrete substances, particularly mucus; propulsion of mucus by ciliary action

Pseudo stratified columnar location

ciliated variety lines trachea and most of the upper respiratory tract; nonciliated type in males sperm-carrying ducts and ducts of large glands

stratified squamous function

protects underlying tissues in areas subjected to abrasion

stratified squamous location

Nonkeratinized type forms the moist linings of the esophagus, mouth, and vagina; keratinized variety forms the epidermis of the skin, a dry epithelium

Transitional function

stretches readily, permits stored urine to distend urinary organ

Transitional location

lines the ureters, bladder, and part of the urethra