1. Do Now! 
What is the definition of a tissue? Give an example of where you can find tissues!
When someone is sick or injured, they may need to replace an organ or tissue.
What do scientists need in order to grow new tissues?

2. Ch. 5: Tissues!!

3. Let’s Create a Beating Heart

4. Do Now!  Where in the body can you find tissues?
Think of the definition of tissues and where you can find them. What are some functions of these tissues?

5. Objectives
To explain the difference between different kinds of tissues
To identify the types of epithelial tissue
To list the locations of each type of epithelial tissue

6. Important Terms Histology: The study of tissues
Tissues: Groups of specialized cells which are similar in structure and perform common functions

7. 4 Types of Tissues Epithelial Connective Muscle Nervous
Make some observations!
Epithelial
Connective
Muscle
Nervous

8. Activity!! 

9. Do Now!!  What are the 4 types of tissues?
There are many different types of epithelial tissue. Hypothesize how you think those types are characterized! (there are 2 ways)

10. 4 Types of Tissues (cont.)
Epithelial:
Form protective coverings
Function in secretion and absorption
Connective:
Provide support and protection
Bind structures together
Muscle:
Produce body movements
Nervous:
Control and coordinate body activities
* Most organs contain all 4 types

11. Epithelial Tissue: Location in Body
Forms covering of body surfaces
Covers organs
Forms inner lining of body cavities
Lines hollow organs
Major tissue in glands

12. Epithelial Tissue (cont.)
Functions:
Protection from physical/chemical injury and invasion
Secretion, excretion, filtration and reabsorption of materials
Diffusion of certain gases
Sensory reception

13. Epithelial Tissue: Facts to Know
One free surface always exposed to the outside or open internal space: apical surface
Attached to basement membrane on the other side
Tightly packed
Avascular: NO blood vessels!! Rely on diffusion from underlying connective tissue
Divides rapidly
Classified according to
top layer of cells

14. Activity!! 

15. Classes of Epithelia (Layers)
Simple: just one layer
Stratified: multiple layers

16. Classes of Epithelia (Shape)
Squamous: squashed (thin and flat, like an egg)
Ex: lines blood vessels and pleural and pericardial cavities
Columnar: columns
Ex: Lining of gut tube; sometimes has cilia
Cuboidal: cubed (square shaped)
Ex: Walls of glands

18. Activity!! 

19. Do Now!! 
Identify the tissues below! C A B D E

20. Squamous Simple Diffusion and filtration
Ex: alveoli, capillary walls, lines blood and lymph vessels
2. Stratified Squamous
Physical protection against abrasion
Protection against pathogens
Ex: Epidermis, oral cavity, esophagus, vagina and anal canal

21. Squamous (cont.) 3. Keratinized Stratified Squamous:
Aging skin cells produce keratin, harden then die
“keratinization”: produces dry, tough, protective covering
Contains layers of dead squamous cells
Prevents water/substance loss
Barrier to organisms

22. Columnar 1. Simple Columnar provides some protection
absorption/secretion
usually contain “goblet” cells
Ex: Uterus, most organs of digestive tract
2. Stratified Columnar
- *rare
secretion/absorption
- Ex: small portion of male urethra

23. Columnar (cont.) *Contains cilia!!
3. Pseudostratified Ciliated Columnar
Appears stratified
- All cells touch basement membrane and have exposed end
Ex: passageway of respiratory system
*Contains cilia!!

24. Cuboidal Simple Cuboidal secretion/absorption secretes sweat
line ducts
Ex: ovaries, kidney tubules, ducts of glands (salivary, thyroid, pancreas and liver)
2. Stratified Cuboidal
*rare
usually only 2-3 layers
Larger ducts of glands
Ex: mammary glands, sweat glands,
Salivary and pancreas

25. Transitional Stratified Tolerates repeated stretching
Ex: bladder, ureters, and urethra

27. Can You Identify the Classes of Epithelium?
Quiz!! E
Can You Identify the Classes of Epithelium? D A B C

28. Activity!!
Try and identify the type of epithelial tissue on the slide.

29. Slides
Simple Squamous
*Lung

30. Slides
Simple Cuboidal
*Kidney

31. Ciliated Pseudostratified Columnar
Slides
Ciliated Pseudostratified Columnar
*Trachea

32. Slides
Stratified Cuboidal
*Sweat gland duct

33. Slides
Simple Columnar
*Small intestine

34. Slides
Stratified Squamous
*Skin

35. Slides
Transitional
*Bladder

36. 1.
Epithelial! 2.
Connective!