Introduction to histology

Question 1

Define a tissue

Answer 1

A group of cell working together to carry out a common function

Question 2

Define an organ

Answer 2

More tissues of different nature compromised in a morphologically recognised structure

Question 3

What is the most commonly used staining process?

Answer 3

Haemotoxylin eoisin

Question 4

Describe the haemotoxylin eosin staining process

Answer 4

Haemotoxylin is a base, therefor it stains acids blue/purple. Eosin is an acid, therefore it stains bases red/pink.

Question 5

Describe fixation

Answer 5

Fixing a tissue to ensure that there is no deterioration. Can be done by freezing using dry ice or chemically using aldehydes

Question 6

Describe embedding

Answer 6

Tissue is put in a mould using either parrafin wax or frozen tissue

Question 7

Sectionning

Answer 7

Cutting tissue into slices. The thinner the slice the higher the resolution of the image

Question 8

What is the function of covering epithelium?

Answer 8

To protect connective tisues

Question 9

What is the function of glandular epithelium?

Answer 9

To secrete materials

Question 10

Name the 3 types of simple epithelium

Answer 10

Squamous, cuboidal and columnar

Question 11

Where would you find simple epithelium

Answer 11

Places that require thin walls ie. gas exchange in alveoli

Question 12

Describe stratified squamous epithelium

Answer 12

Allows the skin to bear stress

Question 13

Describe pseudo-stratified epithelium

Answer 13

Epithelium that is cilliated or has stereocillia ie. in the trachea

Question 14

Describe transitional epithelium

Answer 14

Urothel - found in the urinary bladded

Question 15

Name some key features that covering and glandular epithelium share

Answer 15

Both form layers and have the capability to secrete materials