1. THE TISSUE LEVEL OF ORGANIZATION
TISSUE — a group of similar cells performing a common function
4 MAJOR TYPES :
1. EPITHELIAL TISSUES — tissues which cover or line the body’s internal/internal surfaces
2. CONNECTIVE TISSUES — support, protect, bind together the other tissue types
3. MUSCLE TISSUE — consists of specialized cells (muscle fibers) capable of shortening in length (contraction) and thus producing movement.
4. NERVOUS TISSUE — consists of specialized cells (neurons) capable of generating and transmitting electrochemical signals (impulses) and thus coordinating the functions of the other tissue types.

2. Nerve

3. Skeletal Muscle

4. Smooth Muscle

5. Cardiac Muscle

6. Simple Columnar

7. Simple Cuboidal

8. Simple Squamous

9. Stratified Squamous

10. Stratified Cuboidal

11. Stratified Columnar

12. Ciliated Pseudostratified Columnar and Hyaline cartilage

13. Transitional

14. Adipose

15. Dense Fibrouse

16. Elastic

17. Reticular

18. Areolar (adult)

19. Hyaline

20. Elastic Cartilage

21. Fibrocartilage

22. Bone