Epithelium II Flashcards
What is the definition of a membrane?
Membranes are sheets of epithelial tissue that cover or line internal structure
What are membranes classified as?
Membranes are either classified as:
- mucous
- serous
- synovial, also cutaneous membrane
What is the function of the mucous membrane?
- Lines alimentary/reproductive tract
- prevents chemical and mechanical injury
- defence against micro organisms and foreign particles
- prevents dehydration of tissues
What is the function of the serous membrane?
Lines the cavities that are not open to the external environment where they secrete a lubricating fluid which reduces friction from movement
What are the names and function of the 2 layers of simple squamous epithelium in the serous membrane?
- parietal layer which lines walls of a cavity
- visceral layer which surrounds the outside of organs and secretes a thin watery serous fluid
Where are serous membranes found?
- the pleura
- the pericardium
- the peritoneum
What is the function of serous fluid?
Serous fluid allows organs to glide freely within the cavity
What is the synovial membrane?
The synovial membrane is not an epithelial membrane, but consists of areolar connective tissue and elastic fibres
What do cells within the synovial membrane do?
They secrete clear, sticky, oily fluid (synovial fluid)
What is the function of the synovial membrane?
It lubricates joints, maintaining stability and therefore preventing injury
What is glandular epithelium?
Groups of epithelial cells that produce a specialised secretiom
What are the 2 types of glandular epithelium?
- exocrine and endocrine
What is the function of exocrine glands?
Exocrine glands discharge secretion onto the epithelial surface of an organ (directly or via duct)
What is an example of an exocrine gland?
salivary glands or digestive glands
What is the function of an endocrine gland?
Endocrine glands discharge hormones directly into the bloodstream
