Epithelial Tissue

4 Main types of tissue

Epithelial, Connective, Muscular, Nervous

Epithelial

Protective Covering

Connective

Supportive and connecting structures, Provide barrier, Passage for substances, secretes substances

Muscular

Movement

Nervous

Communication

Squamous

Flat, jigsaw pieces are blue, purple cytoplasm; blue nucleus. Their function is to diffuse, filter, secrete, and absorb. These are found in the lining of blood vessels, Alveoli, Lining of body cavities. Cells are enable molecules to be distributed rapidly, large surface area to volume ratio

Simple Cuboidal

Small cube-like shape (rarely perfect cube). The function is to diffuse molecules and transport secretions. They are found in the Kidney Tubules and Glands and gland ducts. ex: ring shaped formation around urine in the kidneys and around a developing egg in the ovaries

Simple Columnar

Elongated Nuclei, Blue cytoplasm, can have cilia and goblets. Found in the stomach, colon, and Fallopian tube

Stratified Squamous

Top layer clearly stratified. Bottom layers undefined cells. The function is to PROTECT against abrasion. Found in the esophagus and the vagina

Stratified Squamous-Keratinized

Top layer of cells- dead, lower layers are living. Their function is protection against abrasion. These are found in on the skin

Transitional Epithelial Tissue

Stratified cells with irregular shapes. Function is to accommodate fluctuations in volume of fluid. The can be found in the urinary bladder.

Pseudostratified Columnar

Little cellular definition, a single layer of cells but not all reach the free surface, contain cilia. Function is to synthesize and secrete mucus. Can be found in the nasal cavity, trachea, bronchi. NUCLEI LOOK STRATIFIED BUT AREN'T

Glandular Epithelial Tissue

Simple Columnar Epithelial Tissue. Dark Nuclei at edge, free surface passageway at center, big goblets therefore produces GOBS of mucus