Topic 3 Tissues: Epithelial tissue Flashcards
(21 cards)
What are the 4 types of tissues?
- Epithelial
- Connective
- Muscular
- Nervous
Function of epithelia tissue:
Covers and lines body surface and cavities
Function of connective tissue:
Protects & supports
Function of muscular tissue:
Generates physical force for movement
Function of nervous tissue:
Coordinates body activities
What is the structure of cells within epithelial tissue?
The cells are close together- Continuous sheets
What type of surface does epithelial tissue have?
Apical surface
Epithelial tissue has a basement membrane of?
Connective tissue
Epithelial tissue has no blood vessels meaning it is?
Avascular
Explain the term innervation in epithelial tissue.
Has a nerve supply
Epithelial tissue has a high capacity for?
Cell division
What are the 2 categories of epithelium?
Simple Epithelium
Stratified Epithelium
How to identify simple epithelium
Has 1 layer of cells
How to identify Stratified Epithelium
Has more than 1 layer of cells
What are the 4 cell shapes
- squamous
- cuboidal
- columnar
- transitional (change shape)
What is simple epithelium important for?
Important for filtration (kidneys) or diffusion (lungs & capillaries)
How to identify squamous cells
Squamous= single layer of flat cells.
When is simple epithelium called endothelium?
Called endothelium when lining heart, blood and lymphatic vessels
When is simple epithelium called mesothelium?
Called mesothelium when in serous (watery) membranes – line a body cavity that does not open to the exterior e.g. pleura, pericardium and peritoneum.
What are the 4 key identifying factors of stratified squamous epithelium?
- Apical (top) layer of cells are flat
- Deep layers vary from cuboidal to columnar
- Cells in the basal layer divide and move upward toward apical surface
- Found in areas of surface wear & tear
