Covering and Lining Epithelium and Glandular Epithelium

Classifications of epithelium based on location and function

simple or stratified

Simple epithelium

single layer of epithelial cells found in places where you have little wear and tear

Two types of simple epithelium

endothelium and mesothelium

Endothelium

lines blood vessels, lymph vessels, alveoli, capillaries, and heart

Mesothelium

lines walls of body cavities and covers the viscera within them (pleura and peritoneum)

Stratified epithelium

multiple layers of epithelial cells found in places with a lot of wear and tear

Cell shape classifications

squamous, cuboidal, columnar, and transitional cells

Squamous cells

flat cells

Cuboidal cells

cube cells found in glands and their ducts

Columnar cells

long rectangular cells that typically line mucous membrane

Transitional cells

cells that can change shape, found in urinary system

How do you name stratified epithelium

based on the shape of surface cells

Function of glandular epithelium

secretion

Gland

may consist of one cell or group of specialized epithelial cells that secrete substances into ducts, onto surfaces, or into blood

Two types of glands

exocrine and endocrine

Exocrine glands

secrete their product into a duct

Examples of exocrine glands

mucous, ear wax, sweat glands

Endocrine glands

ductless

Example of endocrine gland

thyroid gland (secretes hormones into bloodstream)