Epithelial Tissue

Question 1

Covers…

Answer 1

All surfaces

Question 2

Derived from _____________

Answer 2

Embryonic layers

*lines internally and externally

Question 3

Functions (5)

Answer 3

Protection
Tissue absorption
Secretion
Sensory
Specialized functions

Question 4

Epithelial histology:

Closely grouped cells with little or no _________ _________

Capable of renewal by _______

Answer 4

Intercellular substance

Diffusion

Question 5

Bounded together by (2)

Avascular:

Answer 5

Desmosomes
Hemidesmosomes

No circulation
*near conn tissue so it’s capable through diffusion

Question 6

Unstratisfied epithelium:

Single layer of cells that lines (3 items)

Answer 6

Lines blood and lymph vessels, heart, lungs, kidneys = squamous

Lines glands and gland ducts = cuboidal

Lines inner enamel epithelium (IEE) = makes enamel

Question 7

Stratisfied epithelium: (lines oral mucosa)

2 or more cell layers

Classified by surface layers (cell shape)
1
2
3
4

Answer 7

Squamous- keratinized(H2O proof) or nonkeratinized(not H2O proof)

Cuboidal- salivary glands

Columnar- salivary glands

transitional

Question 8

Epithelial renewal rate and repair:

Regeneration-

Answer 8

Cells lost at superficial layer and produced at deepest layers.

Question 9

Renewal rate and repair:

Oral epithelium renews faster than ____.

Gingiva; ______ days
Lining of mouth; _____ days

Answer 9

Skin.

4-6

10-14

Question 10

Epithelial repair depends on…

Answer 10

How deep injury

How old patient

Question 11

Basement membrane-

Answer 11

Thin,nonliving structure b/w epithelium and connective tissue

Question 12

Basement membrane 2 layers:

Answer 12

Basal lamina- 2 layers

• lamina densa (closest to conn dark layer)
• lamina lucida (light layer)

Reticular lamina- deepest of basement membrane, collagen fibers and reticular fibers

*bm attached to epithelium

Question 13

4 types of tissue

Answer 13

Epithelial
Connective
Muscle
Nerve