Histology Topic 2: Epithelial Tissue Flashcards
What are the general functions of Elithelial Tissue?
- Protection
- Secretion
- Selective
- Absorption
- Excretion
- Trans-cellular
- Transport/diffusion
- Sense organ
What is the general structure of Epithelial Tissue?
- Polarised with an apical surface that faces
the lumen. Basal surface is located interior
-Thin sheets of cells tightly packed
What is Simple Epithelial Tissue?
A single-layered epithelium that is adapted for diffusion
What is Stratified Epithelial Tissue?
A multi-layered epithelium adapted for protection
What resources the shapes of Epithelial Tissue?
- Squamous
- Cuboidal
- Columnar
What is pseudostratified epithelium?
A single layer of epithelium that has a stratified appearance due to the difference in size of the nuclei of the adjacent cells.
What is the Basement Membrane and what is its function?
- Noncellular layer directly beneath epithelial tissue
- Composed of proteins secreted by epithelial cells and
connective tissue - Function: Provides structural support to overlying cells.
Attaches epithelial layer to underlying tissues
Where is Simple Squamous Epithelium found in the body?
▪︎Air sacs of lungs
▪︎lining of heart (mesothelium), blood vessels (endothelium) and lymph vessels
▪︎major cavities
What is the function of Simple Squamous Epithelium?
▪︎To allow materials to pass through by diffusion and filtration
▪︎To secrete lubricating substances
Where is Simple Cuboidal Epithelium found in the body?
▪︎ In ducts and secretary portions of small ducts
▪︎ In the kidney tubules
What is the function of Simple Cuboidal Epithelium?
▪︎ To secrete and absorb
▪︎sensory reception (nose, ears and taste buds)
Where is Simpler Columnar Epithelium found in the body?
▪︎Ciliated: bronchi, uterine tubes, uterus
▪︎Smooth/ Non-ciliated: Digestive tract and bladder
What is the function of Simple Columnar Epithelium?
▪︎Absorbs
▪︎Secretes mucus and enzymes
Where is Pseudostratified Columnar Epithelium found in the body?
Ciliated pseudostratified elithelium lines the trachea and much of the upper respiratory tract
What is the function of Pseudostratified Columnar Epithelium?
▪︎Secretes mucous
▪︎Cilia moves mucous