Where would you find Epithelial tissue?
Epithelial cover every exposed surface of your body. Epithelial form the surface of the skin and line the digestive, respiratory, reproductive, and urinary tracts.
Name the 4 types of tissue found in the body?
- Epithelium tissue
- Connective tissue
- Muscle tissue
- Neuron Tissue
What are the two 'Epithelial-like' tissues and where are they found?
Endothelium - Line cardiovascular system
Mesothelium - Line the internal cavities plural etc
With reference to the Skin - what is the other name for the epithelium?
Epidermis - Stratified Squamous keritising Epithelial.
What are epithelial characteristics?
Is epithelia vascular or Avascular?
What does Contiguious mean?
It is when epithelia cells are closely packed together.
Epithelial cells are polarised. What dose this mean?
They are not the same on all sides. They have different regions, apical, lateral and basal. These regions are known as domains.
How is epithelia classified?
- Number of cell layers
- The shape of the cell
- The presence of any surface specialisations
In regards to Epithelial cells what does cellularity mean?
It refers to the various types of cell junctions between the cells.
In regards to epithelial cells what does polarity mean?
the presence of structural and functional differences between the exposed and attached (different cell) surfaces.
What are the four functions of epithelial tissue?
- Provide physical protection
- Control permeability
- Provide sensation
- Produce specilised secreations
What is a basolaterial surface and what is the name of the other surface?
The base and sides of the cell. Apical surface
Where is the Cilia found?
The respiratory tract or Fallopian tubes.
Where is villi found?
What are the 3 different types of cellular junction?
- Tight Junction
- Adherence Junction
- Gap Junction
What is the name of the junction used to hold the cell to the basement membrane?
Where are micro filaments found?
Inside the Villi
Where are micro tubules found?
Inside the cillia
What are squamous cells?
What does stratified mean?
What is stratified transitional epithelium?
Epithelium that can change shape
When looking at a squamous layer, how do you classify the type of cell? i.e Stratified _________ epithelal
You look at the top layer of the epithelial and call it that. i.e. skin is Stratified Squamous Epithelia
Where might you find a Simple squamous epithelial layer?
Lining of the alveoli, kidney tubules - used in areas where absorption is needed, fragile layer.
Whats the difference between the classification of Simple and stratified layers?
Simple is only one cell deep whereby stratified in many cells deep.
Where might you find Stratified squamous epithelial?
Surface of skin; lining of mouth, throat, esophagus, rectum, anus, and vagina
What is pseudo-stratified columnar epithelium?
Epithelium that gives the impression that is many layers but is in fact singular - found in the trache and Broncus
What is the name given to the simple squamous epithelium lining the plural cavity?
Give 4 ways glands are classified?
- Types of secretions,
- Modes of secretions,
- Gland structure
- Shape of Secretory unit
List the 3 modes of secretions
Melocrine (eccrin) - vesicles (most common)
Apocrine - shredding of cytoplasm and apical surface
Holocrine - cell bursting
List the 3 types of secretions.
Serous - watery liquid
Mucous - mucous liquid
Seromucus - Mixed - variety of glandular cells
What are the two main groups of glands?
What are there differences?
Exocrine and Endocrine
Exocrine - secrete onto the skin
Endocrine - secrete into the blood i.e, hormones
Give some examples of Exocrine glands?