AT 1: Membranes Flashcards
What is a membrane?
A thin sheet of tissue or layer of cells acting as a boundary, lining or partition in an organism
Types of membranes (2)
-epithelial
-connective
Subtypes of epithelial membrane
-mucous
-cutaneous
-serous
Subtype of connective membrane
Synovial
Epithelial membrane structure
-lines internal structures or cavities
- composed of epithelium (v. Thin layer of cells) attached to a layer of connective tissue
Epithelial membrane function acronym
PASR
Functions of epithelial membrane (4)
-to protect underlying tissues
- to absorb
-to secrete
- to recept sensory information
Location of epithelial membrane
-lines cavities that are exposed to the external environment and internal organs
Epithelial membrane examples
- cutaneous membrane (skin): superficial
-mucous membrane: moist-> internal to external
-serous membranes: line cavities internally/ surround organs
Epithelial membrane- Cutaneous membrane structure
The skin
3 layers (epidermis, dermis, subcutaneous)
Epithelial membrane- cutaneous membrane function
To provide a barrier between the external and internal environment to prevent entry of pathogens. PROTECT
Epithelial membrane- mucous membrane structure
One or more layers of epithelial cells overlying a layer of connective tissue
Epithelial membrane- mucous membrane function
- to provide protection: acts as a barrier to external agents/ mucous acts to trap foreign particles
-to provide lubrication: mucous provides lubrication, allowing for the movement of substances e.g food-> link to digestive system
Epithelial membrane-mucous membrane examples
Digestive tract (mouth, oesophagus)
Respiratory tract (nose, pharynx)-> link mucous lining respiratory tract e.g in nose traps foreign particles and prevents them from entering lungs
Is serous membrane deep or superficial
Deep
Serous membranes acronym
PIC
VOO
PIC
Parietal inside cavity
VOO
Visceral outside organ
Parietal serous membrane description
The part of serous membrane that sits on the inside of the cavity (furthest from organ)
Visceral serous membrane description
The part of serous membrane that sits on the outside of the organ (closest to organ)
Connective membrane- synovial membrane structure
Lines the cavities of the joints that move and the surrounding tendons
Connective membrane- synovial membrane function
To prevent friction from damaging the tissue by secreting synovial fluid which acts to lubricate joints
Connective membrane- synovial membrane e.g
Elbow and knee
Similarity between synovial and serous membrane
Both synovial and serous membranes are internal membranes that lubricate cavities to decrease friction during movement
Difference between synovial and serous membrane
Synovial membrane is connective membrane whereas serous membrane is epithelial membrane
Similarity between mucous and serous membrane
Both mucous and serous membrane are types of epithelial membrane that are located within the body and lubricate to decrease friciton
Difference between mucous membrane and serous membrane
Mucous membrane acts as a barrier to external agents and traps foreign particles to prevent entry of pathogens whereas serous membrane does not
Similarity between mucous and synovial membrane
Both mucous and synovial membranes lubricate to decrease friction of movement
Difference between mucous and synovial membrane
Mucous membrane is epithelial membrane whereas synovial membrane is connective membrane
Similarity between mucous and cutaneous membrane
Both mucous and cutaneous membranes act as a barrier to prevent entry of pathogens
Difference between mucous and cutaneous membrane
Mucous membrane can also provide lubrication, allowing for the movement of substances such as food, whereas cutaneous cannot
