A2 - Fuction, Structure And Location Of Tissues Flashcards
What’s the structure of the cuboidal epithelial tissue
- cube-shaped
- spherical nuclei
- short cells with similar thickness and width
Where can the cuboidal epithelial tissue be found?
- kidney tubules
- breast tissue
What is the function of the cuboidal epithelial tissues?
- they cover several organs providing protection against damage and other chemicals
- e.g. ovaries forms ovarian surface that replaces and repairs the damage caused by ovulation
- excrete harmful by-products into urine in kidneys
what is the structure of columnar epithelial cells
- taller
- slightly oval nuclei
Where can the columnar epithelial cells be found?
- inner lining of intestines
- stomach
What is the function of columnar epithelial cells, give an example?
- protects the cell
- acts as a barrier against any bacteria that could be ingested
- e.g. epithelium in stomach provides impermeable barrier against any bacteria that could be ingested
What is the structure of the squamous epithelial tissue?
- very flat
- each nucleus forming lump in the centre
- width is greater than height
Where can the squamous epithelial tissue be found?
- lungs
- blood vessels
- inner lining of mouth
- skin
What are the functions of the squamous epithelial cell
- allow easy movement across the membrane through the cell of small molecules
- allow materials to pass through via diffusion and osmosis
What does squamous mean
Scaly and the flatness of the cells which fit closely together
What is diffusion?
The passage of molecules from a high concentration to a low concentration
What is osmosis?
The passage of water molecules from a high concentration to a low concentration through a semi-permeable membrane
What is the structure of the ciliated epithelial tissue?
have cilia which are tiny hair like structures on the surface of the cell
Where can the ciliated epithelial tissues be found?
In the lining of the respiratory tract
What is the function of the ciliated epithelial tissue?
to clear the respiratory tract where mucous and air are pushed up to the back of the throat where it can be swallowed
What is the structure of compound epithelial tissue?
It has several layers of cells
Where can the compound epithelial tissues be found?, give an example
Where the body is likely to wear and tear e.g. the skin
What is the function of the compound epithelial tissue?
- to protect multiple layers of cells
- to obstruct the passage of materials
What is the structure of keratinised compound epithelial tissue?
They have numerous layers of dead squamous cells
Where can the keratinised epithelial tissues be found?
- skin
- inside of mouth e.g. tongue
What are the functions of the keratinised epithelial tissue?
- filled with keratin which is a protein that gives the tissue a waterproof outer layer which prevents microorganisms from entering
- reduce evaporation
- important where there is physical absorption
What is the function of the simple epithelial tissues?
To
- protect cells
- secrete substances
- absorb substances
What is the structure of the blood connective tissue
- does not contain organelles
- liquid part is made up of water, salts and proteins
- solid part contains red blood cells, white blood cells and platelets
Where can the blood connective tissue be found?
- in blood vessels
- blood vessels take blood to and from every part of our body
- blood is pumped through blood vessels by your heart
