Histology – Introduction and epithelial tissue

Question 1

What are the 4 types of tissues ?

Answer 1

• Epithelial tissue
• Connective tissue
• Nervous tissue
• Muscle tissue

Question 2

Where is epithelial tissue found ?

Answer 2

• Covers a surface or line a body
cavity
• Separate inner cells of hollow
organs from content

Question 3

What are the characteristics of epithelial tissue ?

Answer 3

• Highly cellular
• Little or no extracellular material
• Presence of cell junctions
• Avascular (no blood vessels)
• Have a polarity
• Supported by connective tissue
• Regenerate themselves

Question 4

What are the functions of epithelial tissues in the body ?

Answer 4

• Protection
• Transport
• Secretion (glands)

Question 5

What is the apical surface ?

Answer 5

Faces the outside of the body or inside a cavity

Question 6

What is the basal surface ?

Answer 6

Placed beneath the cells (inside the body).

Question 7

How are epithelial tissues named ?

Answer 7

First name is defined by the number of cell layers.
(Simple = 1 layer,
Stratified = more than 1 layer)

Second name is defined by the shape of the cell
(Squamous-scale like, Cuboidal-cube like, Columnar-elongated).

Question 8

What is the function of simple epithelium ?

Answer 8

1. Transport

2. Secretion

Question 9

What is the function of stratified epithelium ?

Answer 9

1. Protection (from wear and tear)

2. Secretion

Question 10

If stratified, what layer of cells determines the second name ?

Answer 10

The apical layer

Question 11

Where is stratified squamous found?

Answer 11

mouth, esophagus, and vagina, protects against abrasion

Question 12

Where is transitional epithelium found?

Answer 12

bladder, ureters, urethra. It is very stretchable which allows the urinary organs to expand and stretch.

Question 13

What is glandular epithelium?

Answer 13

One or many cells that synthesize and secrete a product