Epithelia

Question 1

2 main types of epithelia

Answer 1

Simple & Stratified

Question 2

Types of simple epithelia

Answer 2

Simple
Squamous
Cuboidal
Columnar

Pseudostratified

Question 3

Types of stratified epithelia

Answer 3

Stratified
Squamous
Cuboidal
Columnar

Transitional epithelium

Question 4

Characteristics of simple squamous epithelia

Answer 4

• Best suited for passive transport of substances
• Provide little protection
⟶ Alveoli, blood vessels (endothelium), body cavities (mesothelium)

Question 5

Characteristics of simple cuboidal epithelia

Answer 5

Associated with secretion and/or absorption

⟶ thyroid, kidney, lung, ovary, ducts and secretory portions of many glands

Question 6

Characteristics of simple columnar epithelia

Answer 6

Associated with secretion and/or absorption

⟶ intestine, female reproductive tract, many exocrine glands

Question 7

Characteristics of simple pseudo stratified epithelia

Answer 7

Secretion and movement of particles along tubular organs

⟶ a.k.a “respiratory epithelium”: trachea, bronchi,

Question 8

Characteristics of stratified squamous epithelia

Answer 8

Covers most external and some internal body parts
Protects underlying tissues & prevents their desiccation
Keratinisation can occur but this depends on the species & organ

Question 9

Characteristics of stratified cuboidal epithelia

Answer 9

Not abundant

Found covering areas of transition between simple and stratified epithelia

Question 10

Characteristics of stratified columnar epithelia

Answer 10

Not abundant

Found covering areas of transition between simple and stratified epithelia

Question 11

Characteristics of transitional epithelia

Answer 11

Only in the urogenital system; also called the ‘urothelium’

Cell shape depends on internal pressure i.e. stretchy