1. “TISSUES- BEYOND KLEENEX”

2. What is a tissue??
Groups of cells that are similar in structure and function
4 Types: epithelium, connective, nervous, muscle

3. EPITHELIAL TISSUE “covering”
Apical surface
“covering”
Function= protection, absorption, secretion, excretion
Location= body surfaces
Cells fit closely together
No blood supply
Divides quickly
Basement membrane

4. Types of Epithelial Tissue
Characterized by shape & # of layers
Simple (1 layer)
Stratified (many layers)

5. Simple Squamous Epithelium
Single, flat, thin, fish-like
Alveoli (lungs), capillaries

6. Simple Cuboidal Epithelium
Single, cube-shaped
Nucleus in center
Glands, kidneys, ovaries

7. Simple Columnar Epithelium
Single, long
Nuclei near basement membrane
Thick
Goblet cells- produce mucus
Digestive tract

8. Pseudostratified Columnar Epithelium
Appear layered, but NOT
cilia
Respiratory tract

9. Stratified Squamous Epithelium
Many layers, thick & flat
Protection
Esophagus, mouth, outer skin

10. Stratified Cuboidal Epithelium
Layers, cubed
Protection
Sweat ducts
Rare

11. Stratified Columnar Epithelium
Layers, columns
Rare
Male urethra

12. Transitional Epithelium
Modified stratified squamous
Stretchable
Only in urinary system

13. Glandular Epithelium Cells produce and secrete substances
Endocrine Glands- secrete into body fluids or blood (hormones)
Exocrine Glands- secrete onto surface (sweat)

14. QUIZ
Epithelial Quiz
Histology

15. CONNECTIVE TISSUE support, protection, binding together
Most abundant tissue in the body
Extracellular matrix- nonliving, liquid, gel-like, or hard
Collagen fibers (white -tendons)
Elastic fibers (elastic -yellow- vocal chords)
Reticular fibers (very fine)

16. Bone Tissue Rigid & hard (hard matrix) Support & protection
Osteocytes (bone cells) in lacunae (cavities)
Blood supply good,
heals fast

17. CARTILAGE- Hyaline Cartilage
More flexible
Chondrocytes (cells) in lacunae
Nose, larynx,bone ends,
fetus skeleton (growth of bones)

18. CARTILAGE- Elastic Cartilage
Ear, larynx
More flexible than hyaline cartilage
Elastic fibers

19. CARTILAGE- Fibrocartilage
Shock absorber
Knee caps,vertebrae
Contains collagenous fibers

20. Dense Connective Tissue
Closely packed collagen fibers
Tendons, ligaments
Blood supply low;
heals slow

21. Loose Connective Tissue- Areolar tissue
Delicate, thin, more matrix
Cushions organs
Binds skin to organs

22. LOOSE CONNECTIVE TISSUE- Adipose Tissue
FAT cells
Stored oil pushes nuclei to side
Insulation & protection

23. LOOSE CONNECTIVE TISSUSE- Reticular Connective Tissue
Lymph nodes, spleen, bone marrow
Reticular fibers
Used as support

24. Blood Cells & nonliving plasma; blood cell = biconclave discs
Transportation of…
WBC, RBC, platelets, plasma

25. Muscle tissue Contract in response to stimuli
Muscle fibers can shorten
Three types
Skeletal
Smooth
Cardiac (heart)

26. Skeletal Muscle Specialized to contract Attached to bones Voluntary
Striations,
many nuclei

27. Cardiac Muscle Striated, 1 nucleus, intercalated disks Involuntary
Heart only

28. Smooth Muscle No striations 1 nucleus, cells pointed at ends
Involuntary
Stomach, bladder

29. Nervous Tissue Cells & neurons
Found in brain, spinal column, and peripheral nerves
Senses changes in the body and surroundings
Coordinate, regulate, and integrate many body functions

30. Nervous Tissue Includes neuroglial cells Cells
support and bind the components of nervous tissue
Carry out phagocytosis
Supply nutrients