Types of Epithelium & FUNCTION

Epithelial Tissue.

Cover exposed surfaces, line internal passageways, produce glandular secretions

Function: Secretion, conduit, absorption Term applied to epithelia that appear to be stratified (i.e., have nucleus at various levels) but in which all component cells reach the base of the epithelium and are attached to the underlying basement membrane; lines the respiratory tract

Pseudostratified Epithelium

Simple Squamous Epithelium FUNCTION (3)

allow substances to diffuse easily through cell or be filtered thru it; secretion; reduces friction

Stratified Squamous Epithelium FUNCTION (1)

physical protection to underlying tissues against abrasion & pathogens

Simple Cuboidal Epithelium FUNCTION (2)

secretion absorption

Stratified, can change the thickness depending on its environment Function: Barrier, distensible property

transitional epithelium

Simple Columnar Epithelium FUNCTION (3)

*absorption; secretion of mucus, enzymes, and other substances; movement of mucus by cilia

What are the 4 functions of Epithelial Tissue

1. Provide physical protection 2. Control permeability 3. Provide sensation 4. Produce specialized secretions

Microvilli Function(2

Functions: Increased absorptive surface area, passive movement

____ ____ Epithelium:This single layer tissue type is most often involved in diffusion and filtration.

Simple Squamous

Function: Barrier, conduit Location: Largest ducts of exocrine glands, anorectal junction

Stratified columnar epithelium

Function: Barrier, conduit Location: Sweat gland ducts, large ducts of exocrine glands, anorectal junction

Stratified cuboidal epithelium

____ ____: Among other functions, this multi-layer tissue stretches to accommodate distension of _____ structures.

Transitional Epithelium, Urinary

Transitional Epithelium FUNCTION (2)

easily allows stretching (full bladder) and recoiling (empty bladder)

Pseudostratified Columnar Epithelium FUNCTION (3)

protection; secretion; movement by mucus by cilia

Function: Absorption, secretion Location: Small intestine, colon, stomach lining, gastric glands, gall bladder

simple columnar epithelium

Function: Absorption, barrier, conduit secretion Location: Small ducts of exocrine glands, kidney tubules, thyroid follicles, ovary surface (germinal epithelium)

simple cuboidal epithelium

Function: Exchange, barrier, lubrication Location: generally identified by flattened, elongated nuclei found lining the lumen of a vessel, as the cytoplasm cannot be seen; endothelium - vasculature, body cavity - mesothelium, kidney - bowman's capsule, lung - respiratory spaces.

simple squamous epithelium

Location: Epidermis, oral cavity, esophagus, vagina Function: Barrier, protection. Covers surfaces that are subjected to abrasion, with the epithelium constantly replacing itself by division of the basal layer of cells; the cells change morphology as they move toward the surface and are ultimately sloughed off.

stratified squamous epithelium