Tissues And Epithelial Tissue Flashcards
What is the function of epithelial tissue?
Protect, secret, and absorb; covering and lining
Epithelial tissue: vascular or avascular?
Avascular; epithelial tissues do not have blood flow
What are the 2 forms of epithelial tissue?
Form 1: surface, lining epithelial
Form 2: glandular, secreting epithelial
Where is “surface, lining epithelium” mostly found?
Vast majority of the body
Types of layers of epithelial:
Simple and stratified
Characteristic shapes of epithelial:
Squamous, cuboidal, and columnar
Simple:
Single layer of cells
Stratified:
Multiple layers
Squamous:
Thin; flat cells
Cuboidal:
Cube shaped cells
Columnar:
Long column shaped cells
Simple squamous function
Allows passage by diffusion
Stratified squamous function
Protects from abrasion
Simple columnar function
Absorption, secretes muchos, enzymes
Simple cuboidal function
Secretion and absorption
Where is simple squamous found
Kidneys, air sacs of lungs
Where is stratified squamous found
Lining of organs (mouth, esophagus, vagina)
Where is simple columnar found
Digestive tract, ducts, glands
Where is simple cuboidal found
Kidney tubes, ducts, small glands
The 4 major tissue types are:
Epithelial, connective, muscle, and nervous
The 3 types of cell junctions are:
Tight junctions, desmosomes, and gap junctions
Tight junctions:
Barriers regulating water, solute movement
Desmosomes:
Tightly welded together by glycol proteins; rivets and membranes
Gap junctions:
Communicating junctions, direct chemical communication
Which cell junction is rare
Gap junctions
What is our skin mostly made of
Epithelial tissue
