Epithelial Tissue

Question 1

Barrier Function

Answer 1

Movement of substances

Separate environments

Question 2

Diagram

Answer 2

Lumen, Apical , Lateral , basal, Interior

Question 3

Epithelial cells are described as being

Answer 3

polar

Question 4

Epithelial cells tightly bound to each other benefits

Answer 4

Protection against microbes

Movement of substances

Question 5

Tight junctions

Answer 5

Impermeable seal between cells

Prevents water passage

Question 6

Desmosomes

Answer 6

Strong junctions
Epithelial tissues can stretch and contract

Question 7

Difference between tight junctions and desmosomes

Answer 7

Desmosomes - some flow

Question 8

Functions

Answer 8

Protection - skin
Diffusion - Capillaries
Absorption - Gastrointestinal tract/renal tubules
Secretion - G + D

Question 9

How can epithelial tissue structure differ?

Answer 9

Shape of cells
Number of cell layers
Apical specialisations

Question 10

Shape of cells

Answer 10

Squamous
Cuboidal
Columnar

Question 11

Number of layers

Answer 11

1 = simple epithelium
2+ = Stratified epithelium

Question 12

What does pseudostratified apply to

Answer 12

Columnar

Question 13

What is the layer that features different types of epithelial cells

Answer 13

Transitional

Question 14

Apical Specialisations

Answer 14

Microvilli - Increase apical surface area
Cilia - Movement
Keratin - Protective apical layer

Question 15

Simple epithelial - selective diffusion/secretion/absorption

Answer 15

Simple Squamous - Passive diffusion

Simple cuboidal - secretion/absorption. Ducts in salivary glands

Simple columnar - absorptive surfaces

Question 16

Tissues involving Cilia functions

Answer 16

Simple columnar ciliated - ovum from ovary to uterus

Pesudostratified columnar ciliated - Mucus towards pharynx. Airways (endothelium)

Question 17

Goblet cells

Answer 17

Make mucus
In simple columnar epitheliums (modified). respiratory and gastrointestinal

Question 18

Transitional Epithelium

Answer 18

Expansion and stretch
Only found in the bladder

Question 19

Stratified epithelia

Answer 19

Stratified cuboidal function is secretory.

Stratified columnar function is secretory and protective. Urethra and glands

Question 20

Stratified squamous epithelia

Answer 20

Protection from Abrasion. Cells shed as anucleate squames.

Question 21

Stratified squamous epithelia part 2

Answer 21

Nonkeratinised or keratinised. Accumulate keratin filaments

Question 22

What is the disease A

Answer 22

Oral squamous cell carcinoma

Question 23

What is disease A (description)

Answer 23

Dysplastic epithelial cells proliferate
and Invade tissues

Question 24

Ulceration

Answer 24

Epithelium breakage. Herpetic Stomatitis (infectious) - Small pale vesicles
Traumatic ulcer (Non-infectious)- yellow brown, distinct. Minimum inflammation