1. Tissues Part 1
August 31, 2016

2. What are these?
Tissues!
Left  right, top  bottom: hyaline cartilage, areolar, bone, pseudostratified columnar epithelial, adipose, smooth muscle, transitional epithelial, simple squamous epithelial, dense regular connective

3. Major Tissue Types & Functions
Epithelial Tissue –
lining, covering, & glandular
Connective –
protecting, supporting, and binding together
Muscular – movement
Nervous - control

4. Epithelial Tissue
Epithelial tissues lines all body surfaces and cavities
Functions:
protection
absorption
filtration
secretion

5. Epithelial Tissue Special features of epithelial tissue:
Cells are tightly bound together
Basal surface attached to basement membrane, apical surface is free.
Avascular – no blood supply. Nutrition and gases diffuse from underlying connective tissue
Excellent regenerative ability. Contain multi- and uni-potent stem cells.
Basement membrane is a network of collagen fibers secreted by the epithelial cells
Contain multi- and uni

6. Epithelial Tissue
Turn & Talk: How does each special feature relate to the functions of epithelial tissue? - 2 min
Basement membrane is a network of collagen fibers secreted by the epithelial cells
Contain multi- and uni

7. Epithelial Tissue Basic Shapes
Basement membrane is a network of collagen fibers secreted by the epithelial cells
Contain multi- and uni

8. Classification of Epithelial Tissues
Simple squamous epithelium
A single layer of thin cells,
specializing in rapid
diffusion and filtration
Found in: alveoli of lungs,
walls of capillaries, kidney
glomeruli, and
serosae

9. Classification of Epithelial Tissues
Simple squamous epithelium
A single layer of thin cells,
specializing in rapid
diffusion and filtration
Found in: alveoli of lungs,
walls of capillaries, kidney
glomeruli, and
serosae
Picture of alveoli of lungs.

10. Classification of Epithelial Tissues
Simple cuboidal epithelium
A single layer of cube-
shaped cells
Found in: glands,
kidney tubules, ovaries
Kidney tubules

11. Classification of Epithelial Tissues
Simple columnar epithelium
A single layer of tall
shaped cells
Often contain mucus-
producing Goblet cells
and / or cilia
Found in: digestive
tract (unciliated),
bronchi (ciliated), and
uterine tubes (ciliated)
Small intestine

12. Classification of Epithelial Tissues
Simple columnar epithelium
A single layer of tall
shaped cells
Often contain mucus-
producing Goblet cells
and / or cilia
Found in: digestive
tract (unciliated),
bronchi (ciliated), and
uterine tubes (ciliated)
Uterine tube

13. Classification of Epithelial Tissues
Pseudostratified columnar epithelium
A single layer of cells
that differ in length.
Often contain cilia and
Goblet cells
Found in:
respiratory tract
trachea

14. Classification of Epithelial Tissues
Pseudostratified columnar epithelium
A single layer of cells
that differ in length.
Often contain cilia and
Goblet cells
Found in:
respiratory tract
Notice that the nuclei appear at different levels.
For our purposes: nuclei at different levels + cilia = pseudostratified columnar epithelia
trachea

15. Classification of Epithelial Tissues
Stratified Squamous Epithelium
Multiple layers of epithelial tissue.
Flattened and atrophied (‘dead’) at the apical edge; but can be rounder at basal edge.
Apical edge sloughs off and is replaced.
Function: protection from wear & tear
Found in skin, mouth, esophagus
Esophagus?

16. Classification of Epithelial Tissues
Transitional epithelium
Cells can change shape, allowing the tissue to stretch.
Apical cells appear round when tissue is relaxed, and flat with tissue is stretched.
Found in urinary tract.
Ureter tube

17. Classification of Epithelial Tissues
Transitional epithelium
Cells can change shape, allowing the tissue to stretch.
Apical cells appear round when tissue is relaxed, and flat with tissue is stretched.
Found in urinary tract.
Notice that the cells look rounded and irregular.
Ureter tube

18. Quick Review: Epithelia Tissue
Show with fingers:
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional

19. Quick Review: Epithelia Tissue
Show with fingers:
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice the cube-like shapes, and single layers separated by basement membrane

20. Quick Review: Epithelia Tissue
Show with fingers:
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional

21. Quick Review: Epithelia Tissue
Show with fingers:
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice the many layers, and how the cells gradually become flatter

22. Quick Review: Epithelia Tissue
Show with fingers:
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional

23. Quick Review: Epithelia Tissue
Show with fingers:
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice multiple layers, cells rounded and irregular

24. Quick Review: Epithelia Tissue
Show with fingers:
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional

25. Quick Review: Epithelia Tissue
Show with fingers:
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice the nuclei at different levels, and the cilia

26. Exit Ticket: These are some slides from the beginning of class … can you name them now?
Left  right, top  bottom: hyaline cartilage, areolar, bone, pseudostratified columnar epithelial, adipose, smooth muscle, transitional epithelial, simple squamous epithelial, dense regular connective