1. Integumentary System: Tissues

2. Bellwork
Describe a time when you saw a band play live. What type of instruments did they have? How were these instruments arranged on stage?

3. What advantages does this seating arrangement confer?
Easy for conductor to control
more effective function (sound) than if different instruments were randomly distributed among each other
easier for individual instrumentalists within an instrument group to harmonize and cooperate

4. Would these same advantages be useful in the human body?
Yes!
How does the body achieve these advantages?
Through organization of cells with similar structure and function into tissues.
Tissue: groups of cells that are similar in structure and function.

5. Cell Specialization What is an example of a specialized cell?
Muscle fiber
What advantages does specialization confer?
Perform specific function
Work efficiently to perform function
Join with like specialized cells (instrument section)
Different types of specialized cells work together (entire symphony)

6. Tissue Types Think of 4 tissue types as parts of an airplane
epithelium = covering = skin of aircraft
connective = support = internal airframe
muscle = movement = engine
nervous = control = cockpit

7. Bellwork
List and describe the geometry of three (3) types of Epithelial tissue. Where might we find these types? What do they do?
Squamos – flattened – lining of hollow organs, body cavities, covering outer surfaces; function in filtration/protection
Cuboidal – cube-shaped – lining of glands and some organs – function in secretion and absorption
Columnar – tall and thin – lining of digestive tract – function in secretion/absorption

8. Epithelial Tissue

9. Where are epithelial cells found?
Cover surfaces
Cover organs
Line hollow organs
Line body cavities

10. Functions of epithelial cells
Filtration
Secretion
Absorption
Covers surface
Protection

11. Characteristics of Epithelial Tissue
Tightly packed: Little substance between cells
Tightly bound to each other: close junctions
Avascular: (not near blood for nutrients)
Don’t conduct (like nerve cells)
No blood vessels to provide nutrient supply
Must use neighboring tissue for nutrients and waste

12. Characteristics of Epithelial Tissue
4. Thin a) Need to get nutrients b) when thick, they are dead (skin) 5. Have two surfaces: (Figure 5.1) a) basement membrane that cell sits on b) apical (free) surface

13. Figure 5.1

14. Pair Activity Several simple epithelial cells will be projected.
In pairs and on a half-sheet of paper, discuss
a) cellular geometry
b) function that the cell might serve and why

15. Slide #1
Simple squamous

16. Slide #2
Simple cuboidal

17. Slide #3
Simple columnar

18. Slide #4
Simple cuboidal

19. Review 4 types of tissue Characteristics of epithelial tissue
Where is epithelial tissue found?
Functions of epithelial tissue

20. Compare and Contrast A. B. One layer of cells (A)
Several layers of cells (B) B.

21. How are these cells different?B. A.
pancake
Circle, bricks, boxes C. D.
Vertical, long, compact
Puzzle pieces, vertical

22. Simple Squamous Where? Capillary, lines blood vessels
Function? Filtration and exchange

23. Simple Cuboidal Where? Glands, ducts, nephron of kidney, ovaries
Function? Secretion, absorption

24. Simple Columnar Where? Lines digestive tract from stomach to anus
Function? Absorption, secretion, protection

25. Pseudostratified Columnar
Where? Respiratory cells, looks stratified but is simple (sit on basement membrane)
Function? Protection, secretion, mucus movement

26. Stratified Squamous Where? Epidermis of skin, oral cavity, esophagus
Function? Protection against abrasion/impact/environmental factors

27. Stratified Cuboidal
Rare
Protection

28. Stratified Columnar
Rare
Protection, secretion

29. Transitional Epithelium
Where? Bladder, lungs, kidney, where expansion is favorable
Function? Change position with respect to each other, “distensibility”/expansion