Epithelial Tissue (Revised)

4 Types of Tissue

- epithelial -muscle
-connective -nervous tissue

Tissue

group of similar cells that together carry out a specific job

Histologist

Study of tissue

Pathologist

studies the diseases of cells and tissues

Cellularity

more cells than matrix

Junctions

Anchor cells together so it can remain in a continuous sheet

Basement Membrane

bottom of epithelial tissue that has glycoproteins and reticular fibers

Microvilli

increases surface area for absorption

Avascular

no blood vessels

Cilia

sweepers and cleaners

Simple Squamous

- diffusion, permeability, filtration, slick
- Lungs, heart, blood vessel, kidneys

Simple Cuboidal

-one layer
-secretes
-glands

Endocrine Glands

secretes hormones directly into blood

Exocrine Glands

products are carried by a duct to a hollow organ (digestive enzymes) or out of body (sweat)

Simple Columnar w/ microvilli

- absorption of nutrients
-intestines

Simple Columnar w/ cilia

- sweeps eggs
-fallopian (uterine) tube

Pseudostratified Columnar

-secretes mucus, sweeps out debris
-upper respiratory tract (trachea, bronchi, bronchioles)

Goblet Cells

Single cell gland that secrete mucus

Stratified Epithelium

-more than one layer, classified by top layer

Stratified Squamous

-takes friction, is a barrier, protects from fluid loss
-Esophagus, skin, mouth

Connective Tissue

Type of tissue that stratified squamous sits on top of

Mitotic Cells

Cells in the stratified squamous tissue that regenerate (mitosis)

Melanocytes

make and release melanin

melanin

skin, eye, and hair pigment

Keratin

waterproof protective top layer of skin

Stratified Cuboidal

-layered
-secretes
-glands

Desquamification

Friction causing top layer of stratified squamous cells to fall off

Transitional Epithelium

-stretch to squamous shape (full) to cuboidal (empty)
- urinary bladder

Stratified Columnar

- protection
- surrounds sphincter muscles, at end of stomach