Tissue Flashcards
Which type of tissue forms glands?
Epithelia
Is the epithelia vascular or avascular?
Avascular, it relies on the connective tissue for blood supply
What is the name given to the top and bottom of epithelia cells?
Apical - exposed to the surface cavity
Basal surface
What is the function of squamous epithelial cells?
Fast absorption and diffusion, making thin membranes
What is the function of cuboidal cells?
Absorb nutrients and produce secretions
What is the function of cuboidal cells?
Cushions underlying tissues
What is meant by pseudostratified?
Mostly one layer, cells with different shapes and sizes
What is the basement membrane?
The basement membrane is a thin, fibrous, extracellular matrix of tissue that separates the epithelium from underlying connective tissue.
What does the basement membrane consist of?
The basal lamina and the underlying layer of reticular connective tissue
What is the basal lamina?
It is the layer of extracellular matrix on which the epithelium sits
What is the reticular connective tissue composed of?
A network of collagen fibres
What is the difference between endocrine and exocrine glands?
Endocrine - secretes hormones into the blood stream or nearby cells
Exocrine - secretes their juices into tubes or ducts
Which type of gland loses contact with the cell surface?
Endocrine
What are the two types of tubular glands?
Tubular or acinar
or they can mix to form tubuloacinar
What is the difference in secretions between acinar and tubular glands?
Acinar - Thick mucus
Tubular - Secretes thinner liquids which can travel easily from tubular glands
What are the two types of exocrine gland?
Mucous and serous
What are the products of mucous and serous glands?
Mucous - mucous - a secretion rich in proteglycans
Serous - a secretion rich in proteins often enzymes
What is the function of myoepithelial cells?
Cuboidal cells that contract to secrete sticky mucous
Why can’t you store steroid hormones?
And what do you store instead?
They would immediately leave the cell
Instead you store their precursors (lipids)
What are all steroids derived from?
Cholesterol