2. 1. Epithelial – covering & lining 2. Connective – support 3. Muscle - movement 4. Nervous - control

3. Epithelial Tissue

4. 1. Protection 2. Secretion 3. Absorption 4. Filtration

5. 1. Composed of sheets of closely packed cells  cells are often strongly connected via tight junctions and desmosomes Tight junctions are common in lining of the stomach & intestines. Why? Desmosomes are common in the epidermis. Why?

6. Look at the cartoon below (it represents the epithelium that lines much of your respiratory tract). Do you see much space between these cells? Now look at the actual slide and notice the same thing.

7. 2. Has polar sides  Apical Surface  Apical Surface – side open to exterior or body cavity  Basal surface  Basal surface – rests on a basement membrane of connective tissue

8. 3. Avascular 3. Avascular – no blood vessels  Depends on diffusion of nutrients from underlying tissues 4. Has the capacity to regenerate

9. 1. number 1. number of cell layers  Simple  Simple – 1 layer  Stratified  Stratified – more than 1 layer 2. shape 2. shape of cells in the apical layer  Squamous  Squamous – flat, scale-like  Cuboidal  Cuboidal – cube-like  Columnar  Columnar – column-like

10. Locations  Alveoli – air sacs of lungs  Kidney  Endothelium – lining of heart and blood vesselsFunctions  Rapid diffusion  Filtration In peneumonia, a build-up of mucous can increase the distance that the gases move. Why does this make it “harder to breathe?”

11. Locations  Liver  Pancreas  Most glands  Kidney tubulesFunctions  Absorption  Secretion

12. Locations  Inner linings of:  GI Tract  Gallbladder  Uterus & uterine tubesFunctions  Absorption & Secretion Microvilli  Intestines; Microvilli increase S.A.  Movement of egg & embryo  Cilia  Secretion of mucous Goblet cells  by Goblet cells

13. Locations  Epidermis of skin  Keratinized  Keratinized – filled with keratin  Lining of  Oral cavity  Tongue surface  Esophagus  Vagina & anal canalFunctions  Protection

15. Locations  Sweat gland ducts  Ovarian follicle – cells surrounding egg Functions  Secretion  Sweat  Ovarian hormones To the left, we have an oocyte (egg cell) surrounded by stratified cuboidal epithelium. The oocyte is circled in blue

16. Locations  Rare  Large ducts of sweat and salivary glands Functions  Structure

17. Locations  Respiratory tract from nasal cavity to bronchi  Ciliated  Goblet cellsFunctions  Mucous traps dust & bacteria  Cilia sweep debris away from lungs

21.  Smoking paralyzes the cilia so they have to cough violently to expel mucous ..Then they die!

22. Locations  Urinary tract Functions  Stretches to allow filling of urinary organs

23. Locations  Pancreas  Stomach  Sweat glands  Salivary glands  Mammary glands  Oil glands  Goblet cellsFunctions  Secrete material into ducts that lead to a tract or body surface

24. Locations  Thyroid  Thymus  Pituitary  Adrenal  Testes  OvariesFunctions  Secrete hormones into the bloodstream where they travel to other cells