Tissue Classification Flashcards
4 Types of Tissues
Epithelia
Connective
Muscular
Nervous
Covering and Lining Epithelia
forms a continuous layer all over the free surfaces of the body externally (skin) or internally (tubes in lungs)
Glandular Epithelia
make up most of the glands in the body where their main task is to secrete something
Two Types of Covering/Lining Epithelia
Simple and Stratified
Simple Squamous
flat in shape
Simple Cuboidal
cube shaped, wider than they are tall
Simple Columnar
taller than they are wide
Pseudostratified Columnar
simple columnar cells whose nuclei appear at different heights giving the misleading impression they are stratified
Simple Epithelia
- consists of a single layer of cells
- thinness of these layers is important for absorption, secretion, and filtration
Stratified Epithelia
- consists of multilayered cells to help with protection
- can be keratinized or non-keratinized
Keratinized
most exterior cells are dead and lose their nucleus and cytoplasm
Stratified Squamous
- apical layer is squamous in shape and basal layers are either cuboidal or columnar
- most widespread stratified type
Stratified Cuboidal
-composed of two cuboidal layers
Stratified Columnar
- rare in body
- mainly found in pharynx, male urethra
Transitional Epithelium
- cells in basal layer are cuboidal or columnar
- cells in apical layer have ability to change shape based on whether organ is stretched or relaxed (ex.bladder)