Types of Tissues

Epithelial

Functions: protect us from outside world (skin); absorbs (stomach and intestinal lining{gut}); filters (kidney); and secretes (forms glands).

Characteristics: closely attached to each other forming protective barrier; always has one free surface open to outside the body or inside an internal organ; always had one fixed section attached to underlying connective tissue; has no blood vessels but can soak up nutrients from blood vessels in connective tissue underneath; can have lots of nerves in it; and very good at regenerating.

Classification: by shape – squamous (flat and scale-like; cuboidal (as tall as they are wide); columnar (tall, column-shaped); by cell arrangement – simple epithelium (single layer of cells{usually for absorption and filtration}); stratified epithelium (stacked up call layers {protection from abrasion – mouth, skin})

‘specialized’ types = transitional and pseudostratified

Simple squamous – function: diffusion, filtration, secreation, absorptionn, and some protection vs friction.

Simple Cuboidal – function: active transport and facilitated diffusion, secretion by cells of glands, movement of particles embedded in mucus

Simple Columar – functions: movement of particles, secretions by cell of glands, stomach and intestine, absorption by cells.

Pseudostraified Epithelium – function: synthesize and secrete mucus onto the free surface and moev mucus or fluid over the surface of the cell.

Stratified squamous – function: protection vs abrasion and infection.

Stratified Cuboidal – functions: secretions, absorption and protection vs infection.

Stratified columar – function: protection and secretion.

Transiitional Epithelium (only found in urinary tract) – function: accommodate changes in volume of organ.

Epithelial tissue also forms glandular tissue

Connective

Functions: wraps around and cushions and protects organs; stores nutrients; internal support for organs, as tendons and ligaments protects joints and attached muscles...