Epithelial Tissues Flashcards
functions of epithelial tissues
- covering
- protection
- absorption
- filtration
- secretion
epithelial tissues are found ____
covering surfaces and lining body cavities
epithelium can be classified based on
- shape
- layers
- special definitions
epithelium based on shape
- squamous
- cuboidal
- columnar
epithelium based on layers
- simple
- stratified
epithelium based on special definitions
- pseudostratified
- transitional
simple epithelial tissue includes
- simple squamous
- simple cuboidal
- simple columnar
- pseudostratified columnar
stratified epithelial tissue includes
- stratified squamous
- stratified cuboidal
- stratified columnar
- transitional
differences of squamous, cuboidal, and columar
- squamous - cells are flat, nucleus are centrally-located
- cuboidal - cells are cube-like, nucleus are centrally located, width and length almost similar
- columnar - cells are tall than wide, representing columns, nucleus are basally-located
differences of simple and stratified
- simple - one layer of epithelial tissue, underlined by a single basement membrane
- stratified - two or more layers of epithelial tissue, each layer underlined by a basement membrane
difference between pseudostratified and transitional
- pseudostratified - classified under simple epithelium, made up of cells of various heights but location of nucleus vary - some found in the apex, in the base, or near the middle of the cell
- transitional - changes shape because of regular distension
the stratified appearance in pseudostratified epithelium is brought by
- irregular positioning of nucleus
- unequal sizes of the cells
tissues are group (aggregation) of cells with _______ , performing the _______ and are bound by the ______
- similar form
- same function
- extracellular matrix
second platform of biological organization, above the cell and under the organ & organ system
tissue level
total number of cell types in humans
210
epithelium in the tracheal linings
pseudostratified columnar
epithelium in the mucus linings of the lower urinary tract
transitional epithelium
epithelium in the kidney
cuboidal
tissue linings found mostly in the respiratory and digestive tract
columnar
made up of spherical to polygonal cells mostly found in the corneal layer of the skin epidermis that are filled with protein keratin
keratinized squamous
made of thin spherical and polygonal cells that make up the mucosal linings of cavities (eg., oral cavity)
non-keratinized squamous
epithelium that make up glandular tissues (eg., mammary glands, sweat glands, salivary glands)
stratified cuboidal
epithelium that make up the linings of pharynx, conjunctiva, and urethra of males
stratified columnar
