Epithelium

Question 1

Generally where does epithelial tissue exist?

Answer 1

1. As a sheet of cells that covers a body surface or lines a body cavity.
2. Occurs at the interface of two different environments
3. Occurs in most of the body’s glands

Question 2

How is epithelium classified?

Answer 2

1. Number of layers
2. Shape of cells involved

Question 3

What are the two types of layers?

Answer 3

Simple (one layer)

Stratified (more than one layer)

Question 4

What are the various types of shapes of cells involved?

Answer 4

1. Squamous (flat cells)
2. Cuboidal (cube like cells)
3. Columnar (column like cells)

Question 5

What type of epithelium is a single layer of tall cells that may have cilia and/or mucous secreting cells?

Answer 5

Simple Columnar Epithelium

Question 5

What shape of cells has round oval-like nuclei?

Answer 5

Columnar cells

Question 5

What type of epithelium has the function of absorption, secretion of mucous and enzymes, and when ciliated, propels mucous or reproductive cells?

Answer 5

Simple columnar

Question 6

Where is simple columnar epithelium found in the non-ciliated type?

Answer 6

Found lining most of the digestive tract (stomach to anal canal), the gallbladder and excretory ducts of some glands

Question 6

Where is the ciliated simple columnar located?

Answer 6

Found in the small bronchi, uterine tubes and some regions of the uterus

Question 6

Explain the role of an endocrine gland.

Answer 6

They secrete substances directly into the bloodstream

Question 7

Explain the role of an exocrine gland.

Answer 7

They are ducts that carry products onto epithelial body surfaces or into body cavities.

Examples include salivary glands and the liver/pancreas

Question 7

What type of epithelial tissue is a single layer of flattened cells with disc-shaped central nuclei and sparse cytoplasm?

Answer 7

Simple Squamous

Question 7

Which type of epithelial tissue functions to allow the passage of materials by diffusion/filtration in sites where protection is not important?

Answer 7

Simple Squamous

(also secretes lubricating substances in serosae)

Question 7

Where is simple squamous epithelium located?

Answer 7

Found in
1. glomeruli of the kidney
2. air sacs of the lungs
3. lining of the heart (pericardial membrane) 4. blood vessels
5. lympathic vessels and the lining of ventral body cavities

Question 8

What type of epithelial tissue is a single layer of cells that have large spherical central nuclei that forms to secrete and absorb?

Answer 8

Simple Cuboidal

Question 9

Where is simple cuboidal epithelial found?

Answer 9

Located in the tubules of the kidneys, the ducts and secretory portions of small glands and is the surface of the ovary.

Question 10

What type of epithelial tissue is technically a single layer that has cells of differing heights (meaning some do not reach free surfaces)

The nuclei of these cells are seen at different levels and some may contain cilia and goblet cells (secrete mucous)

Answer 10

Pseudo-stratified Columnar

Question 11

What type of epithelium functions to secrete (particular mucous) and to propel mucous by ciliary action.

Answer 11

Pseudo-stratified columnar

Question 12

Where is the non ciliated pseudo-stratified columnar epithelium located?

Answer 12

Found in the the male sperm carrying duct and the ducts of large glands.

Question 13

Where is the ciliated pseudo-stratified columnar epithelium located?

Answer 13

Found in the lining of the trachea, and in most of the upper respiratory tract.

Question 14

What type of epithelium is a thick membrane that is composed of several cell layers?

Answer 14

Stratified Squamous

Question 15

Under the Stratified Squamous Epithelium is what layer of metabolically active cells?

Answer 15

The basal layer of cells is under and contains cuboidal and columnar cells

Question 16

What is the function of stratified squamous epithelium?

Answer 16

It functions to protect the underlying tissue

Question 17

Where is the non keratinized version of the stratified squamous epithelium located?

Answer 17

Forms the lining of the esophagus, mouth, and vagina

Question 18

Where is the keratinized version of the stratified squamous epithelium located?

Answer 18

Forms the epidermis

Question 19

What type of epithelium is generally seen as two layers of cube layers and functions to protect?

Answer 19

Stratified Cuboidal Epithelium

Question 20

Where is stratified cuboidal epithelium found?

Answer 20

Found in the largest ducts of sweat glands, mammary glands and salivary glands.

Question 21

What epithelial layer has several layers of cells that have large oval shaped nuclei and a basal layer that consists usually cuboidal cells?

Answer 21

Stratified columnar

Question 22

What is the purpose of stratified columnar epithelium?

Answer 22

Protection and secretion

Question 23

Where might you find stratified columnar epithelium?

Answer 23

Not found much in the body but has small amounts in the male urethra and in the large ducts of some glands.

Question 24

What type of epithelium resembles both stratified squamous and stratified cuboidal?

Usually the basement cells are cuboidal or columnar and surface cells are dome shaped squamous-like

Answer 24

Transitional Epithelium

Question 25

What is the purpose of transitional epithelium?

Answer 25

They stretch easily and allows the urinary organ to distend

Question 26

Where is transitional epithelium located?

Answer 26

Lining of the ureters, bladder, and part of the urethra.