1. Tissues
Chapter 6

2. Tissues Similar cells with a common function
Histology- study of tissues
Four major tissue types
Epithelial tissue
Connective tissue
Muscle tissue
Nervous tissue

3. Epithelial Tissue

4. Epithelial tissue Tightly packed cells
Adhere to each other and basement membrane
Cover and line
Protects, secretes, absorbs, filters
Classified according to cell shape and number of cell layers

5. Epithelial classification
Use a descriptor from both categories
Cell shape
Squamous- flat
Cuboidal- cube shaped
Columnar- tall
Number of cell layers
Simple- one layer of cells
Stratified- more than one layer of cells

6. Simple epithelial - single layer of cells

7. Stratified- multiple layers of cells

9. Connective Tissue

10. Connective Tissues Very diverse Comprise much of the body
Spaced apart more so than epithelial cells
Functions
Support/protect
Binds structures
Produce blood cells
Most are very vascular

11. Different types
Collagenous- thick fibers, strong, holds structures together
Bone, cartilage, tendons

13. Different types
Elastic- provides elastic quality to parts that stretch
Found in lungs, vocal cords, etc.

14. Different types
Reticular- very thin fibers, forms delicate supportive networks
Soft skeleton around spleen, liver, etc.

15. Adipose tissue
Cushions, insulates, stores fats

16. Bone Most rigid connective tissue Contains matrix of inorganic salts
Supports, protects, attachment for muscles

17. Blood Made of plasma, red and white blood cells, platelets
Transports, defends

18. Muscle Tissue

19. Muscular tissue Composed of muscle fibers
Actin and myosin filaments that slide together
Three types of muscle fibers
Skeletal
Smooth
Cardiac

20. Skeletal muscle Striated cells with multiple nuclei
Occurs in muscles attached to skeleton
Functions in voluntary movement of body

21. Smooth muscle No striations Single nucleus Elongated cells
Involuntary muscle

22. Cardiac muscle Striated cells Single nucleus Occurs in the heart
Involuntary

23. Nervous tissue

24. Nervous tissue Found in brain, spinal cord, peripheral nerves
Composed of neurons and glial cells
Receive and send electrochemical signals