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. Brain & Spinal Cord
Nerve
Nerve Impulse Conduction

3. Skeletal Muscle Attached to Skeleton
Movement, stabilize position of skeleton

4. Smooth Muscle Walls of blood vessels, internal organs
Movement of food, urine, secretions and regulate blood vessel diameter

5. Heart
Cardiac Muscle
Circulates blood and maintains blood pressure

6. Simple Columnar Diffusion, absorption and secretion
Inner surface of trachea, respirator tract and intestines
Diffusion, absorption and secretion

7. Simple Cuboidal
Kidney tubules
Diffusion, absorption and secretion

8. Simple Squamous Capillaries, air sacs (alveoli) and Bowman’s capsule
Diffusion, absorption and secretion

9. Stratified Squamous Skin
Protection against abrasion, pathogens and chemical attack

10. Stratified Cuboidal
Sweat gland ducts, urethra, pharynx and conjunctiva
Protection and secretion

11. Stratified Columnar
Mucous membranes and large excretory ducts of glands
Protection and secretion

12. Ciliated Pseudostratified Columnar
Trachea and bronchi
Protection and secretion

13. Transitional
Bladder
Stretch

14. Adipose Deep to skin, around organs
Padding, cushion, insulation and energy storage

15. Dense Fibrouse Attachment and support
Tendons, Ligaments and covers muscles (Fascia)
Attachment and support

16. Elastic
Lung, wall of artery, trachea, bronchial tubes, vocal cords (Larynx)
Stretching

17. Reticular Liver, kidney, spleen, lymph node and bone marrow
Supporting framework (stroma)

18. Deep to dermis, between muscles, around blood vessels , joints and nerves
Areolar (adult)
Cushion organs and provides support

19. End of Long bones, Ribs, sternum, trachea, bronchi and nasal septum
Hyaline
Support and reduce friction

20. Elastic Cartilage
External ear and epiglottis
Support

21. Fibrocartilage
Intervertebral disk
Support

22. Bone
Skeleton
Structure, support, mineral storage

23. Blood
Circulatory System
Defense and transport