Epithilial Tissue

Question 1

Where is membranous tissue found and what is its role?

Answer 1

Found: skin, lining cavities, ducts, tubes
Role: protection- pathogens, physical injury, toxins, dehydration

Question 2

Where are glandular epithilium found?

Answer 2

Secreting portion of glands e.g thyroid gland

Question 3

Features of epithilium

Answer 3

Tightly packed forming a single sheet
Sit on a basement membrane
Avascular
1 surface which is free
Good nerve supply

Question 4

2 steps to name epithilium

Answer 4

Numbers of cell layers

Shape classification

Question 5

Characteristics of simple squamous epithilium role and location

Answer 5

Single layer of square irregular flat cells
Nuclei centrally located
Role: very thin
Found: lining of blood vessels

Question 6

What is Simple cuboidal epithilium role and found where

Answer 6

Single layer of cuboidal cells with central nuclei
Role: excretion, absorption, secretion
Found: ovaries, salivary glands

Question 7

What is simple columnar epithilium and role and where is it found

Answer 7

A single layer of column like cells with nuclei all at the bottom of the cells
Role: protection and absorption
Found in the GI tract and reproductive tract ( associated with goblet cells) and can be Ciliated

Question 8

What is Pseudostratified columnar epithilium and what’s its role and function

Answer 8

Single layer of columnar cells with nuclei at different levels
Found in respiratory system and used to produce mucus

Question 9

What are Stratified squamous cells role and found where

Answer 9

Many layers of flattened squamous cells, mitosis occurs at the lowest levels, cells increase in size and dehydrate
Can be keratinised for protection
Withstand abrasion
Found in oral, nasal and vaginal cavities

Question 10

What is Stratified columnar epithilium and what’s it role and where’s it found

Answer 10

2-3 layers of cuboidal cells
Found in lining of large ducts sweat glands and urethra
Role: protection and robust

Question 11

Transitional epithilium role and found where

Answer 11

Similar to non keratinised stratified squamous cells except they are large and round
Role surface cells can be stretched and relaxed
Found in the urinary bladder

Question 12

How to classify a glandular epithilium

3 steps

Answer 12

1. Cell number (unicellular- goblet cells) (multicellular- sweat glands)
2. Arrangement of gland branches- simple or compound
3. Type of secretion- Merocrine- most glands release a water product
   - apocrine- portion of the cell is released
   - Holocrine- the cell ruptures

Question 13

What are the two types of epithelial tissue

Answer 13

1. Membranous epithilium

2. Glandular epithilium