revision: Animal tissues

Question 1

Simply define:

1). __EPITHELIAL TISSUE__

Answer 1

🔘aka epithelium

🔘avascular (no blood flow) and have less intercellular space

🔘have a “basement membrane” (made of glycoprotein n mucopolysaccharides)

🔘avascular: hence gets nutrition from underlying “connective tissues”.

Question 2

Further Types of EPITHELIUM,

         On The Basis Of:

[a] SHAPE of the cell:

Answer 2

▪️Squamous Epithelium: flat shape

▪️Cuboidal Epithelium: cubic

▪️Columnar Epithelium: tall w/ nucleus in the bottom

Question 3

[2] NUMBER OF LAYERS present:

Answer 3

▪️Simple Epithelium : single layered.

   ➖simple squamous ep:-
        (single layered flat cells)
   ➖simple cuboidal ep:-
        (single layered cubic cells)
   ➖simple coloumnar ep:-
        (single layered coloumned cell)
   ➖simple ciliated ep:-
        (single layered cells w/ cilia)
        types:   
                   -simple ciliated cuboidal 
                   -simple ciliated columnar
   ➖pseudo stratified ep:-
       (due to difference in size of cells it seems multilayered)

➖glandular ep:-
(cells modified to produce secretions)
types:
- unicellular n multicellular
-exocrine n endocrine
-meso, apo n holocrine

▪️Compound Epithelium: multilayered ep.

➖Stratified ep:-
(has many layers; deepest layer formed by columnar cells, but top layers varies)

        types:
            - stratified squamous ep 
               (keratinised n non keratinised)
            - stratified cuboidal ep
            - stratified columnar ep 

➖transitional ep:- thinner and stretchable multilayered epithelium.