Epithelial Tissues

Question 1

Layers of cells covering internal or external surfaces

Answer 1

Epithelia

Question 2

Structures that produce secretions

Answer 2

Glands

Question 3

Characteristics of Epithelia

Answer 3

1. Cellularity (cell junctions)
2. Polarity (apical and basal surfaces)
3. Attachment (basement membrane of basal lamina)
4. Avascularity
5. Regeneration

Question 4

Cells arranged in continuous sheets,in either single or multiple layers

Answer 4

Polarity (apical and basal surfaces)

Question 5

Functions of epithelial tissue

Answer 5

1. Provide physical protection
2. Control permeability
3. Provide sensation
4. Produce specialized secretions (glandular epithelium)

Question 6

Specializations of epithelial cells

Answer 6

1. Move fluids over the epithelium
2. Move fluids through the epithelium
3. Produce secretions (protection and messengers)

Question 7

protection

Answer 7

move fluids over the epithelium

Question 8

permeability

Answer 8

move fluids through the epithelium

Question 9

Protection and messengers

Answer 9

produce secretions

Question 10

Move fluid

Answer 10

Cilia or ciliated epithelium

Question 11

Increase absorption or secretion

Answer 11

Microvilli

Question 12

Polarity surfaces can be _________ or _________

Answer 12

apical or basolateral

Question 13

3 characteristics that maintain the integrity of the epithelia

Answer 13

1. Intracellular connections
2. Attachment to the basement membrane
3. Epithelial maintenance and repair

Question 14

Form bonds with other cells or extracellular material

Answer 14

Cell junctions

Question 15

Kinds of cell junctions

Answer 15

1. Tight junctions
2. Gap junctions
3. Desmosomes

Question 16

Cell junctions are ________ _________

Answer 16

intracellular connections

Question 17

Intracellular connections’ support and communication are done by:

Answer 17

1. CAMS (cell adhesion molecules)
   - Transmembrane proteins
2. Intercellular cement
   - Proteoglycans
3. Hyaluronan (hyaluronic acid)
   - Glycosaminoglycans

Question 18

Proteoglycans are an example of intercellular connections that give support and communication via

Answer 18

intercellular cement

Question 19

Glycosaminoglycans are an example of intercellular connections that offer support and communication via _________

Answer 19

Hyaluronan (hyaluronic acid)

Question 20

• Between two plasma membranes
• Adhesion belt attaches to terminal web
• Prevents passage of water and solutes
• Isolates wastes in the lumen

Answer 20

Tight junctions

Question 21

Attaches to terminal web (in tight junctions)

Answer 21

Adhesion belt

Question 22

Tight junctions isolates wastes in the ________

Answer 22

Lumen

Question 23

Prevents passage of water and solutes

Answer 23

Tight junctions

Question 24

• CAMS, dense areas, and intercellular cement
• Spot desmosomes
• Hemidesmosomes

Answer 24

Desmosomes

Question 25

Tie cells together | Allow bending and twisting

Answer 25

Spot desmosomes

Question 26

Attach cells to the basement membrane

Answer 26

Hemidesmosomes

Question 27

- Allow rapid communication - Are held together by channel proteins (junctional proteins, connexons) - Allow ions to pass - Coordinate contractions in heart muscle

Answer 27

Gap junctions

Question 28

Gap junctions are held together by channel proteins called _______ ________, _______

Answer 28

junctional proteins, connexons

Question 29

Allow ions to pass

Answer 29

Gap junctions

Question 30

Coordinate contractions in heart muscle

Answer 30

Gap junctions

Question 31

Allow rapid communication

Answer 31

Gap junctions

Question 32

Attachment to the Basement Membrane via a clear layer (lamina lucida) has what characteristics?

Answer 32

- Thin layer - Secreted by epithelia - Barrier to proteins

Question 33

Attachment to the basement membrane via the dense layer (lamina densa)

Answer 33

-Thick fibers -Produced by connective tissue Strength and filtration

Question 34

Dense layer is also known as

Answer 34

Lamina densa

Question 35

Lamina lucida is also known as

Answer 35

Clear layer

Question 36

Dense layer is also known as

Answer 36

Lamina densa

Question 37

Clear layer is also known as

Answer 37

Lamina Lucida

Question 38

Epithelium is singular or plural?

Answer 38

Singular

Question 39

Epithelia is singular or plural?

Answer 39

Plural

Question 40

Epithelia can be classified based on two things. What are these?

Answer 40

Shape and layers

Question 41

Based on shape, epithelia can be what three things?

Answer 41

1. Squamous epithelia 2. Cuboidal epithelia 3. Columnar epithelia

Question 42

Thin and flat

Answer 42

Squamous epithelia

Question 43

Square shaped

Answer 43

Cuboidal epithelia

Question 44

Tall, slender rectangles

Answer 44

Columnar epithelia

Question 45

Single layer of cells

Answer 45

Simple epithelium

Question 46

Several layers of cells

Answer 46

Stratified epithelium

Question 47

Simple epithelium and stratified epithilium are classified based on _______

Answer 47

Layers

Question 48

Squamous epithelia, cuboidal epithelia, and columnar epithelia are a classified based on _______

Answer 48

shape

Question 49

Epithelial maintenance and repair: Epithelia are replaced by division of ________ _______ and happens ________ basement membrane

Answer 49

germinative cells (stem cells), near basement membrane

Question 50

Epithelium in charge of absorption and diffusion

Answer 50

Simple squamous epithelium

Question 51

Epithelium that lines body cavities

Answer 51

Mesothelium

Question 52

Epithelium that lines heart and blood vessels

Answer 52

Endothelium