1. Similar Cells serving the same purpose
Tissues
Similar Cells serving the same purpose

2. Tissue Types and Varieties
Epithelial Tissue
Connective Tissue
Muscle Tissue
Nervous Tissue

3. Epithelial Tissue / Epithelium
Covers the body – lines the cavities
Closely packed cells – no matrix
Contains no blood vessels
Always anchored to a basement membrane.

4. Classification of Epithelial Tissue
By Shape
Squamous – flat and scale-like.
Cuboidal – square or cube-like.
Columnar – columns that are higher than they are wide.
By Arrangement
Simple – single layer, same shape.
Stratified – many layers, same shape.
Transitional – several layers changes from one shape to another.
Pseudostratified – appears stratified, but all cells attached to basement membrane.

5. Connective Tissue Most abundant in the body, widely distributed.
Has the most forms and varieties
Does contain intracellular matrix.
Cells called fibroblasts produce reinforcing fibers.

6. Varieties of Connective Tissue
Areolar – glue that holds organs together. Pg.
Adipose – (fat) lipid or energy storage.
Fibrous – firm yet flexible, ex: tendon.
Bone – calcified matrix, functions in support, protection, mineral storage. Haversian systems are bone building areas.

7. Varieties Continued:
Cartilage – Made of chondrocytes. Firm and plastic-like.
Blood – Liquid is the matrix, cells are red, white, and platelets. Function is transportation of cellular materials.

8. Muscle Tissue
Skeletal - attaches to bones, also called striated or voluntary, striations visible under microscope.
Cardiac - composes walls of heart, also called striated and involuntary, striations visible, intercalated disks present.
Smooth - non-striated and involuntary, lines the blood vessels and tube-shaped organs.

9. Nervous Tissue
Neurons - conduct impulses, rapid communication from brain to organs.
Components=Axon, Dendrite, Cell Body.
Glia - supportive and connective.

10. Tissue Repair and Regeneration
Epithelial and connective regenerate easily.
Ex: skin, bone, tendons and ligaments.
Muscle and nervous have limited abilities to repair.
Ex: paraplegic, quadriplegic, nerve damage.