Chapter 5 (part 1) Epithelial Tissues Flashcards
Tissues
A group of cells with the same size, shape, and functions working together
Histology
The study of tissues
Connective Tissue
Supports, protects, binds together tissues and organs of the body, fills in spaces, stores fat, and produces blood cells
Muscle Tissue
Contracts and moves various parts of the body
Nerve Tissue
Carry out messages through electrical impulses to control and coordinates body functions
Epithelial Tissue
Form protective coverings on body surfaces and function in secretion and absorption
Epithelial Tissues are composed of
Tightly packed cells that provide effective protective coverings for the body
Epithelial Tissues generally lack
Blood supplies (avascular), but nutrients, oxygen, etc can easily diffuse through the cells
Epithelial Tissues heal rapidly when injured because
They are constantly producing new cells through mitosis
Epithelial Tissues are anchored to
Connective tissues below by a basement membrane (nonliving protein “hooks”)
Epithelial Tissues are classified by their
Shape and numbers of layers
Simple Epithelial Tissues have (how many layers)
One layer of cells
Stratified Epithelial Tissues have
(layers)
2 or more layers of cells
Pseudostratified Epithelial Tissues have
layers
A single layer of cells that appear to be more than one layer ( the cells are scattered)
Squam means
Scale-like
Squamous Epithelial Tissue Shape
Thin, flattened, irregularly shaped
Cuboidal Epithelial Tissue Shape
Cube shaped
Columnar Epithelial Tissue Shape
Elongated with the nucleus near the bottom of the cell and often have cilia on top
Glandular Epithelial Tissue Shape
Columnar or cuboid cells that form a “flask” structure that opens into duct and forms a gland
Transitional Epithelial Tissue Shape
Cuboid shaped cells that transition to elongated “stretched” cells
Simple Squmous Epithelial Location
Air sacs of lungs (aleoli), composes wall of capillaries (tiny blood vessels), linings of larger blood and lymph vessels, form the serous membranes of our body cavities
Simple Squmous Epithelial Function
Filtration, diffusion, osmosis, protective covering of surfaces
Stratified Squmous Epithelial Structure
Many layers of thin, flattened irregularly shaped cells
Younger Stratified Squmous Epithelial Structure
Cells are cuboid shaped and then flatten as they move closer to the surface