1. Unit 2- Cells and Tissues

2. Levels of Organization
 Cells – Building blocks of the body
Tissues – A group of similar cells that combine to perform a certain function (4 - muscle,
nervous, connective, epithelial)
Organs – Two or more different types of tissue – combined to perform a certain
function – (kidney, liver, lung)
System – organization of > 2 or more organs perform a more general function

4. Histology-study of tissues
 4 types of tissue in the body
epithelial
connective
muscular
nervous

5. Epithelial Tissue Arrangements:
Simple- Cells are found in a single layer attached to the basement membrane
Stratified- Cells are found in 2 or more layers stacked atop each other
Pseudostratified- a single layer of cells that appears to be multiple layers due to variance in height and location of the nuclei in the cells.

6. Pseudo stratified

7. Epithelial Tissue Shapes:
Squamous- (Latin, squama- scale)- flat, thin, scale-like cells
Cuboidal- cells that have a basic cube shape. Typically the cell's height and width are about equal.
Columnar- tall, rectangular or column-shaped cells. Typically taller than they are wide.

9. Epithelial characteristics:
major tissue of glands
inner lining of body cavities
inner lining of hollow organs
anchored to connective tissue by a basement membrane
lacks blood vessels

17. Connective Tissue functions:
Binds structures
Provides support
Protection
Stores fat
Produces blood cells

18. Connective Tissue characteristics:
Cells farther apart
Intercellular material/matrix between them
FIBROBLAST- major cell creates fibers

25. Muscular Tissue * MOVEMENT of structures or materials 3 Types:
SKELETAL/STRIATED
SMOOTH
CARDIAC

29. NERVOUS TISSUE Transmit electrical impulses throughout the body
Includes- brain, spinal cord, nerves
Neurons- basic unit of nervous system, TRANSMIT impulses
NeuroGLIA- supporting cells, no impulses