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connective tissue
| Term | Definition |
|---|---|
| Epithelial Tissue | Tissue that covers a body surface of lines a body cavity, forms parts of most glands |
| Functions of Epithelial Tissue | To Protect, Absorb, Support, Filter, form Slippery Surfaces |
| Epithelial | are Avascular Has no blood supply |
| Characteristics of Epithelial | Composed of mostly cells, very thin so oxygen and food can easily get to them, differing apical and basal cell regions, supported by an underlying connective tissue, avascular, and high capacity for regeneration |
| How is Epitheliums named | First name indicates number of cell layers, last name describes cell shape |
| Simple | One layer of cells |
| Stratified | More than one layer of cells |
| Squamous | Cells are wide, flat, plate-like |
| Cuboidal | Cells are like cubes |
| Columnar | Cells are tall, like columns |
| Simple Squamous Epithelium | Single layer of flattened cells |
| Function of Simple Squamous Epithelium | To allow passage of materials |
| Simple Squamous Epithelium located | Found in lungs, kidney, blood vessels |
| Simple Cuboidal Epithelium | Single layer of cube-like cells with large special central nuclei |
| Simple Cuboidal Epithelium located | Kidney and ducts of small glands |
| Simple Columnar Epithelium | Single layer of tall cells with round to oval nuclei |
| Function of Simple Columnar Epithelium | To absorb and secrete substances and decide what needs to go in and what goes out |
| Simple Columnar Epithelium located | Stomach |
| Pseudo stratified Columnar Epithelium | Single layer of cells of differing heights, giving the false appearance of more than one layer, when it is actually a single layer |
| Function of Pseudo stratified Columnar Epithelium | Offers protection from stuff you inhale |
| Pseudo stratified Columnar Epithelium located | Found in the Trachea, windpipe |
| Stratified Cuboidal Epithelium | Two layers of cube-like cells |
| Function of Stratified Cuboidal Epithelium | Protection |
| Stratified Cuboidal Epithelium located | Found in Gland Ducts |
| Stratified Columnar Epithelium | Several cell layers, in an elongated column shape |
| Function of Stratified Columnar Epithelium | To Protect and Secrete |
| Stratified Columnar Epithelium located | Rare, but sometimes found in small amounts in ducts of some glands and male uretha |
| Function of Simple Cuboidal Epithelium | to secrete and absorb |
| Transitional Epithelium | Resembles both stratified squamous and stratifed cuboidal. |
| Function of Transitional Epithelium | To stretch, go from one shape to another without breaking |
| Transitional Epithelium located | Found in the Bladder, Ureters |
| Glands | cells that make and secrete product |
| Exocrine Glands | Ducts that carry products to the epithelial surface |
| Exocrines Glands secrete products onto | Onto the body surface (skin) or into body cavities (digestive tube) |
| Examples of Exocrine Glands | sweat glands, oil glands, mammary glands, salivary glands, pancreas, mucus |
| Endocrine Glands | Ductless glands that secrete substances directly into the bloodstream |
| Endocrine Glands | Glands that produce hormones in the body |