Histology of Epithelia

Question 1

4 tissue types in the body?

Answer 1

1. epithelia 2. connective tissues 3.Muscle 4. Nerve

Question 2

What is epithelium?

Answer 2

continuos sheet of cells which adhere closely to one another with little intercellular substance

Question 3

what do the cover?

Answer 3

Both internal and external surfaces

Question 4

What is the basement membrane?

Answer 4

A term given to basal lamina with reticular fibres ( in supporting tissue)

Question 5

do epithelial tissues have capillaries or blood vessels?

Answer 5

No

Question 6

Why are epithelial cells structurally and functionally polarised?

Answer 6

due to substances entering or leaving the body having to cross the epithelium

Question 7

What are the two main functions of epithelium?

Answer 7

Protection and control of transfer ( what passes it)

Question 8

what does specialised to transfer mean?

Answer 8

secretion, absorption or both. Normally SIMPLE one cell thick

Question 9

Where are specialized to transfer epithelial cells found?

Answer 9

lining blood vessels eg alimentary tract, lungs, body cavities

Question 10

what are specialized to protect epithelial cells?

Answer 10

Normally compound ( more than one cell thick)

Question 11

examples of specialised to protect epithelia are?

Answer 11

lining mouth, oesophagus, outer layer of the skin

Question 12

do epithelial cells line glands? like?

Answer 12

yes, salivary and endocrine

Question 13

what does simple epithelia look like?

Answer 13

Question 14

What does simple columnar look like? and where is it found?

Answer 14

absorptive surfaces e.g. smal intestines, secretory surfaces like stomach

Question 15

What does simple cuboidal epithelia look like? and what does it line?

Answer 15

small ducts and tubules that may have excretory, secretory or absorptive functions; examples are the collecting tubules of the kidney and the small excretory ducts of the salivary glands and pancreas.

Question 16

What does simple squamous epithelia look like? and what does it line?

Answer 16

Simple squamous epithelium also forms the delicate lining of the pleural, pericardial and peritoneal cavities where it allows passage of tissue fluid into and out of these cavities.

Question 17

What does pseudostratifies columnar ciliated epitheliam look-like? what does it line?

Answer 17

the fallopian tubes

Question 18

What is stratified epithelium?

Answer 18

epithelium that consists of two or more layers

Question 19

How can pseudostratified epithilium be identified?

Answer 19

Firstly, the individual cells of the pseudostratified epithelium exhibit polarity, with nuclei being mainly confined to the basal two-thirds of the epithelium. Secondly, cilia are never present on true stratified epithelia.

Question 20

what does stratified cuboidal look like and where is it found?

Answer 20

larger excretory ducts of exocrine glands such as the salivary glands.