Tissues Flashcards
What does epithelium tissue do?
- Covers surfaces
- Separates compartments
What are desmosomes?
Cell-cell adhering junctions that provide anchorage and allow uniform movement
What are tight junctions function?
- Sealing intercellular spaces
- Waterproofing and preventing absorbed nutrients from being lost.
What are gap junctions function?
- Allow communication between cells by allowing the transfer of soluble molecules.
What binds epithelial cells to the extracellular matrix (basal lamina)?
Hemidesmosomes
What is the function of epithelial cells in the gut?
Absorption through microvilli
What is the function of cilia?
Movement of extracellular components
Describe simple squamous epithelium.
One cell thick, flat
What are simple squamous epithelium useful for?
Diffusion
Describe simple cuboidal epithelium.
One cell thick, larger cuboid shape cells
What do simple cuboidal epithelium do?
- Secretions
- Absorption
- Found in nephrons
Where do you find simple, columnar epithelium?
- Lining of the digestive tract
What do simple columnar epithelium usually have coming out of the axial layer?
Microvilli
Where do you find stratified sqaumous epithelium?
Epidermis
Where do you find stratified cuboidal?
Ducts of sweat glands
Where do you find stratified columnar?
Pharynx, protection and secretions
What is the name of the epithelial tissue in the liver?
Hepatocytes
What are the functions of the hepatocytes?
- Secretion
- Line blood vessels and bile ducts
What is the function of the epithelium found in kidney nephrons?
- Filtration of blood
- Partial absorption of the filtrate
What is the specialised epithelial tissue found in the bladder?
Transitional stratified epithelium
What can occur from problems with the covering epithelium?
- Under/over secretion
- Lack of cilia (smoking)
- Under/over proliferation
What are endocrine glands?
Glands that secrete into the blood
Example of an endocrine gland
Adrenal gland
What are exocrine glands
Glands that secret onto surfaces
