Epithelia

Question 1

What does epithelia comprise of

Answer 1

It comprises of cohesive sheets of cells, with one or more layers resting on a basement membrane

Question 2

What do epithelia form barriers for

Answer 2

Protection
Absorption
Secretion

Question 3

What is simple epithelia

Answer 3

Single layer of cells on a basement membrane

Question 4

What is stratified epithelia

Answer 4

Tow or more layers of cells on the basement membrane

Question 5

What are characteristics of simple squamous epithelium

Answer 5

Single layer of flattened plate like cells on the basement membrane
Parallel oval nuclei

Question 6

Where can simple squamous epithelium be found

Answer 6

Lines blood vessels
Outside of the lungs
Abdominal organs

Question 7

What are characteristics of simple cuboidal epithelium

Answer 7

Single layer of cells with a similar height and width that sit on a basement membrane
Central spherical nuclei

Question 8

Where can simple cuboidal epithelium be found

Answer 8

Lining the kidney tubules and small ducts

Question 9

What are characteristics of simple columnar epithelium

Answer 9

Single layer of cells taller than they are wide that sit on a basement membrane

May or may not have microvilli

Question 10

Where is simple columnar epithelium be found

Answer 10

Lines the stomach, intestines and uterus

Question 11

What are microvilli

Answer 11

Microscopic projections on a luminal surface of absorptive cells

Question 12

What are the advantages of a tissues having microvilli

Answer 12

Increases surface area

Question 13

Where can you find an example of cells having microvilli

Answer 13

Intestinal cells making up the intestinal brush border

Question 14

What are cilia

Answer 14

Microscopic motile projections on luminal surfaces of cells

Question 15

Where can cilia be found

Answer 15

Respiratory tract and reproductive tract

Question 16

What are features of stratified epithelia

Answer 16

Protective feature
Many layers of cells
Cells are continuously been worn down and replaced by the cells from below

Question 17

Where can stratified epithelia be found

Answer 17

Sites that are subject to abrasive forces

Question 18

What is stratified squamous non-keratinising epithelium

Answer 18

Multiple layer of cells on a basement membrane
Mature surface layers which are plate-like squames

Question 19

Where is stratified squamous non-keratinising epithelium found

Answer 19

Lines the mouth, oropharynx, oesophagus and vagina

Question 20

What are characteristics of stratified squamous keratinising epithelium

Answer 20

Multiple layers of cells on a basement membrane
Mature surface layers are plate-like squames
Waterproof layer of keratin

Question 21

What is an example of stratified squamous keratinising epithelium

Answer 21

Skin

Question 22

What are characteristics of pseudostratified epithelium

Answer 22

Single layer of cells of variable height, which mimicking multiple layers on a basement membrane

All cells in contact with basement membrane

Question 23

Where is pseudo-stratified epithelium located

Answer 23

Lines the conducting airways

Question 24

What is an example of a specialised stratified epithelium

Answer 24

Urothelium

Question 25

What is a basement membrane and its function

Answer 25

Always present in tissue cells It function is to show the difference between epithelium and underlying connective tissue and essential for the proper functioning and survival of the epithelium

Question 26

What is a basement membrane made up of

Answer 26

It is composed of several extra-cellular proteins including collagen IV and fibronectin

Question 27

The basement membrane usually can’t be seen, what is the exception for this

Answer 27

The basement membrane can be seen when stained with PAS

Question 28

What are tight junctions and where are they found

Answer 28

Tight junctions are found in the epithelium and are band-like fusions between cells which prevent diffusions

Question 29

What are desmosomes

Answer 29

They are a type of epithelial junction also known as anchoring/adherent junctions They form plaques which form physical joins between cells and connect the cytoskeletons of adjacent cells which spread forces across several cells

Question 30

What are communicating junctions

Answer 30

They are a type of epithelial junction also known as gap junctions which are electrical junctions that permit the transfer of small molecules They electrically couple adjacent cells

Question 31

What is this tissue

Answer 31

Simple epithelia

Question 32

What is this tissue

Answer 32

Stratified epithelia

Question 33

What tissue is this and where is the image taken from

Answer 33

Simple squamous epitelium The image is of lung alveoli tissue

Question 34

What tissue is this and where is the image taken from

Answer 34

Simple squamous epithelium The image is of peritoneum tissue

Question 35

What tissue is this and where is the image showing

Answer 35

Simple cuboidal epitelium The image is of kidney tissue

Question 36

What tissue is this and where is the image taken from

Answer 36

Simple cuboidal epithelium The image is of a salivary gland

Question 37

What tissue is this and where is the image of

Answer 37

Simple columnar epithelium The image is of the stomach tissue

Question 38

What tissue is this and where is the image taken of

Answer 38

Simple columnar epithelium The image is of small intestine tissue

Question 39

What tissue is this and where is the image of

Answer 39

Stratified squamous non-keratinising epitelium The image is of oesophagus tissue

Question 40

What tissue is this and where is the image of

Answer 40

Stratified squamous non-keratinising epithelium The image is of vaginal tissue

Question 41

What tissue is this and where is this image of

Answer 41

Stratified squamous keratinising epithelium This image is of thin skin

Question 42

What tissue is this and where is the image from

Answer 42

Stratified squamous keratinising epithelium This image is of thick skin

Question 43

What tissue is this and where is the image of

Answer 43

Pseudostratified epithelium The image is of the trachea

Question 44

What tissue is this where is this image of

Answer 44

Urothelium Specialised stratified epithelium This image is showing bladder tissue

Question 45

What is the black line representing

Answer 45

Basement membrane

Question 46

What is this showing

Answer 46

Tight junctions a type of epithelial junctions

Question 47

What is this showing

Answer 47

This is showing desmosomes a type of epithelial junctions

Question 48

What is this showing

Answer 48

They are gap or communicating junctions which are a type of epithelial junctions