Histology of epithelium

Question 1

Name components A-I in this diagram

Answer 1

Question 2

What is the role of the capillary/blood vessel in the connective tissue?

Answer 2

diffusion of nutrients from underlying connective tissue layer

Question 3

Why do we need junctional complexes between epithelial cells?

Answer 3

there is little intercellular substances, require gap junctions for cell to cell communication

Question 4

Where do epithelial cell need to stick to?

Answer 4

adjacent cells and the basement membrane

Question 5

What is the apical and basal side of the epithelium?

Answer 5

apical (surface)
basal (basement)

Question 6

What are the 3 junctions located in the epithelium, communicating 2 epithelial cells?

Answer 6

tight junctions
adherens junctions
gap junctions

Question 7

What is the intermediate filaments connecting epithelial cells together?

Answer 7

desmosome

Question 8

What is the intermediate filament connecting the epithelial cells to the basal lamina?

Answer 8

hemidesmosome

Question 9

What is this an example of?

Answer 9

tight junction

Question 10

What is this an example of?

Answer 10

adherens junction

Question 11

What is this an example of?

Answer 11

gap junction

Question 12

What is this an example of?

Answer 12

hemidesmosome and desmosome

Question 13

What are the 2 basic classifications of epithelium based on number of layers?

Answer 13

Simple - 1 layer
Stratified - made of many layers

Question 14

What are the different cell shapes?

Answer 14

squamous
cuboidal
columnar

Question 15

Name cell shapes is A-C

Answer 15

Question 16

Classify epitheliums A-D

Answer 16

Question 17

What is the structure of squamous epithelium?

Answer 17

single layer of flattened cells

Question 18

What is the function of simple squamous epithelium?

Answer 18

ideal where diffusion/filtration are needed

No protective function

Question 19

Where is the simple squamous epithelium located?

Answer 19

• Inner lining of the heart and vascular tubes
  -Lining of body cavities (serous layer – pleura, pericardium, peritoneum)
• Kidney glomeruli

Question 20

What is the structure of the simple cuboidal epithelium?

Answer 20

• Single layer of cube like cells
• Round central nucleus

Question 21

What epithelium classification is shown?

Answer 21

simple cuboidal epithelium

Question 22

What is the function of the simple cuboidal epithelium?

Answer 22

secretion
absorption

Question 23

Where is the simple cuboidal epithelium located?

Answer 23

Kidney tubules
Small glands– secretory portion and ducts

Question 24

What epithelium is this and what is the arrow pointing to?

Answer 24

Collecting tubule of kidney showing simple cuboidal epithelium

Question 25

What epithelium classification is shown in by the arrows?

Answer 25

simple columnar epithelium

Question 26

What is the structure of the simple columnar epithelium?

Answer 26

- Tall cells in single layer - Free surface may have surface modifications – microvilli, cilia

Question 27

What is the function of the simple columnar epithelium?

Answer 27

Secretion Absorption Propelling mucus

Question 28

Where is the simple columnar epithelium located?

Answer 28

Non-ciliated variety: Digestive tract Ducts of large glands

Question 29

What is arrows at 'A' pointing to?

Answer 29

Question 30

What classification of epithelium do these images show?

Answer 30

Pseudostratified (ciliated) epithelium in respiratory passages pseudostratified epithelium

Question 31

What is the structure f the pseudostratified epithelium?

Answer 31

- Single layer of columnar cells of different heights - Gives false appearance of more than 1 layer of cells - Is always ciliated

Question 32

What is the function of the pseudostratified epithelium?

Answer 32

Propulsion of mucus Secretion of mucus Helps in clearing surface of debris

Question 33

Where is the pseudostratified epithelium located?

Answer 33

Respiratory conducting passages ie. from trachea all the way down to respiratory bronchioles

Question 34

What epithelial classification does the image show?

Answer 34

stratified squamous epithelium SKIN- KERATINISED

Question 35

What are the 2 types of stratified squamous epithelium?

Answer 35

keratinised and non-keratinised

Question 36

What is the epithelium classification shown here?

Answer 36

stratified squamous epithelium OESOPHAGUS - NOKERATINISED

Question 37

What is the structure of the stratified squamous epithelium?

Answer 37

- Multiple layer of cells - Basal layer cuboidal/columnar lies on basement membrane, metabolically active. - Cells on surface flattened - May be dead cells (keratinised epithelium)

Question 38

What is the function of the stratified squamous epithelium?

Answer 38

Protection from abrasion, dessication, waterproofing

Question 39

Where is stratified squamous epithelium locacted?

Answer 39

- Skin (keratinised) - Oesophagus (nonkeratinized) - Lining of vagina (nonkeratinized)