Histology epithelium

Question 1

Describe epithelia…

Answer 1

A cohesive sheet of cells resting on a basement membrane.

They form barriers for:
protection, absorption and secretion.

Question 2

What are the two types of epithelia?

Answer 2

Simple epithelia - single layer of cells on a basement membrane.

Stratified (compound) epithelia - Two or more layers of cells on a basement membrane.

Question 3

What is this type of epithelia?

Answer 3

Simple epithelia

Question 4

What is this type of epithelia?

Answer 4

Stratified (compound) epithelia

Question 5

Describe simple squamous epithelia…

Answer 5

Function: Allows materials to pass through by diffusion and filtration. Secretes lubricating substances

Location: Alveoli in lungs. Lining of the heart, blood vessels and lymphatic vessels.

Question 6

Describe simple cuboidal epithelia…

Answer 6

Function: Secretion and absorption.

Location: Ducts and secretory portions of small glands. Kidney tubules.

Question 7

Describe simple columnar epithelia…

Answer 7

Function: absorption and secretes mucous and enzymes.

Location: ciliated tissues (bronchi, uterus, uterine tubes)
non-ciliated tissues (digestive tract and bladder)

Question 8

Describe pseudo-stratified columnar epithelia…

Answer 8

Function: Secretes mucous
Location: ciliated (respiratory epithelia)

Question 9

Describe stratified squamous epithelia…

Answer 9

Function: Protects against abrasion.

Location: Oesophagus, mouth, vagina

Question 10

Describe stratified cuboidal epithelia…

Answer 10

Function: Protective tissue

Location: Sweat glands, salivary glands, mammary glands.

Question 11

Describe stratified columnar epithelia…

Answer 11

Function: Secretion and protection

Location: male urethra and some glands.

Question 12

Describe transitional (urothelium) epithelia…

Answer 12

Function: Allows urinary organs to expand and stretch

Location: Bladder, urethra, ureters.

Question 13

What type of epithelia is this:

Answer 13

Simple squamous

Question 14

What type of epithelia is this:

Answer 14

Simple cuboidal

Question 15

What type of epithelia is this:

Answer 15

Simple coloumnar

Question 16

What type of epithelia is this:

Answer 16

Pseudo-stratified columnar

Question 17

What type of epithelia is this:

Answer 17

Stratified squamous

Question 18

What type of epithelia is this:

Answer 18

Stratified cuboidal

Question 19

What type of epithelia is this:

Answer 19

Stratified columnar

Question 20

What type of epithelia is this:

Answer 20

Transitional (urothelium)

Question 21

What is this image showing and what type of epithelium is this?

Answer 21

Peritoneum

Simple squamous

Question 22

What is this image showing and what type of epithelium is this?

Answer 22

Lung alveoli

Simple squamous

Question 23

What is this image showing and what type of epithelium is this?

Answer 23

Kidney

Simple cuboidal

Question 24

What is this image showing and what type of epithelium is this?

Answer 24

Salivary gland

simple cuboidal

Question 25

What is this image showing and what type of epithelium is this?

Answer 25

Stomach Simple columnar

Question 26

What is this image showing and what type of epithelium is this?

Answer 26

Small Intestine Simple columnar

Question 27

What structure is this image showing and where is it located?

Answer 27

Microvilli within the small intestine

Question 28

Describe microvilli...

Answer 28

Microscopic projections on luminal surface of absorptive cells.

Question 29

What structure is this image showing and where is it located?

Answer 29

Cilia on the Fallopian tubes

Question 30

What structure is this image showing and where is it located?

Answer 30

Cilia on trachea

Question 31

Describe cilia...

Answer 31

Microscopic projections on luminal surface of cells. Found in the respiratory tract and the reproductive tract.

Question 32

What is this image showing and what type of epithelium is this?

Answer 32

Pigmented skin Stratified epithelia

Question 33

What is this image showing and what type of epithelium is this?

Answer 33

Oesophagus Stratified squamous non-keratinising epithelium

Question 34

What is this image showing and what type of epithelium is this?

Answer 34

Vagina Stratified squamous non-keratinising epithelium

Question 35

What is this image showing and what type of epithelium is this?

Answer 35

Thin skin Stratified squamous keratinising epithelium

Question 36

What is this image showing and what type of epithelium is this?

Answer 36

Thick skin Stratified squamous keratinising epithelium

Question 37

What is the difference between keratinising and non-keratinising stratified squamous epithelium?

Answer 37

Non-keratinising epithelium lacks protein such as keratin in the cells.

Question 38

What is this image showing and what type of epithelium is this?

Answer 38

Trachea Pseudo-stratified epithelium

Question 39

What is this image showing and what type of epithelium is this?

Answer 39

Badder Urothelium

Question 40

What is this image highlighting?

Answer 40

Basement membrane in vagina

Question 41

What is this image highlighting?

Answer 41

Basement membrane in the kidneys.

Question 42

Describe the basement membrane...

Answer 42

Composed of several extra-cellular proteins (collagen IV, fibronectin). Can be seen when stained with PAS.

Question 43

Describe this epithelial junction...

Answer 43

Desmosomes / anchoring / adherent junctions A plaque that forms physical joins between cells and connects the cytoskeletons of adjacent cells. They spread forces across several cells.

Question 44

Describe this epithelial junction...

Answer 44

Tight Junction / Occluding junction A band like fusion between the cells that does not easily allow molecules to pass through. They prevent diffusion between cells.

Question 45

Describe this epithelial junction...

Answer 45

Gap / communicating junctions Electrical junctions that allow the transfer of small molecules They electrically couple adjacent cells.