Glandular Epithelia L04 Flashcards
What 2 main types of glands are there
1) Endocrine - secretes into blood stream
2) Exocrine - secretes into ducts
What are the three different modes of glandular secretion by exocrine glands
1) Merocrine - secreted via exocytosis
2) Holocrine - whole cell ruptures, releasing all of the secretary substances
3) Apocrine - tip of cell is shed which contains all of the secretary substances
What are the types of glandular secretion by exocrine glands
1) Mucous - sticky (cells stain lightly)
2) Serous – watery (cells stain darkly)
3) Sebaceous - oily
Most glands produce only one type of secretion. Some, however, such as …………. gland are mixed
Lacrimal
What 3 layers is the tear film made of
1) Mucin layer
2) Aqueous layer
3) Lipid layer
What is the simplest structural division exocrine glands can be placed into
Unicellular or multicellular
Examples of unicellular glands
Goblet cells - these produce mucous
Theres many of them in the conjunctiva forming the mucous layer of the tear film
Where can goblet cells be found
In the gut goblet cells protect/lubricate
In the conjunctiva they produce part of the tear film
They are also found in the trachea and ducts of salivary glands
Multicellular glands can be distinguished by
Having a single duct (simple) or several ducts (compound)
What is the Meibomian gland example of and what does it do
Meibomian gland is in the eyelid and is an example of a simple multicellular gland and forms the lipid layer of the tear film
A non-ocular example of simple multicellular gland
The colon in the digestive tract
Example of a compound multicellular gland
Lacrimal gland, which produces the aqueous layer of the tear film
What is an acinar compound gland
A gland which has many sac like structures
