Tissues 1 Flashcards
Describe epithelial tissue.
- It covers surfaces and separates compartments
- Forms glands
- Cells are connected and define function
- Has a diversity of secondary functions
Describe connective tissue.
- It connects
- Structure and function defined by fluid and extracellular matrix
- Liquid to solid matrix
- Includes blood, bone and adipose
Describe muscle tissue.
- Long thin cells which have cytoplasm packed with contractile apparatus
- Contractile
- Shortens in length and closes down spaces
What kind of muscle tissues are there?
- Skeletal
- Smooth
- Cardiac
Describe nervous tissue.
- Important in communication
- Consists of neurones and support cells
- Receives, generates and transmits electrical signals
- Integrates information from around the body
How does epithelial tissue maintain coverage of surfaces?
- No contact inhibition
- Cell-cell junctions
- Cell-ECM junctions
What is a desmosome?
A cell-cell junction
What is the purpose of a desmosome?
Firm anchorage
What is the structure of a desmosome?
Two cells stick together by a plaque of protein and filamentous proteins radiate out.
What is a tight junction?
A cell-cell junction
What is the function of a tight junction?
Seals intracellular spaces
What is a gap junction?
A cell-cell junction
What is the function of a gap junction?
Cell to cell communication
How do gap junctions allow for communication?
- Signals go between the cells
- Holes are punched in the membrane which allow for the movement of ions
What is the basement membrane composed of?
- Reticular lamina
- Basal lamina
