HBT Epithelial Flashcards
What is epithelial tissue needed for?
For protective and secretory purposes
What is the purpose of transport epithelium?
Protection, absorption and secretion
What is surface epithelium?
Continuous sheets of cells that cover body and organ surfaces and line hollow structures
What is glandular epithelium?
Downgrowth of epithelium into underlying deep tissue and proliferation (rapid reproduction) to form secretory glands
What are the morphological features of epithelial tissue?
- Cellularity
- Adhesion
- Polarity
- Attachment
- Regeneration
- Avascularity
What are the functions of epithelia?
- Sensation
- Secretion
- Selection
- Absorption
- Protection
What terms are used to describe the thickness of epithelia?
- Simple (one cell thick)
- Stratified (many cells thick)
What terms are used to describe the shape of epithelia?
- Squamous
- Cuboidal
- Columnar
What is simple squamous epithelia used for?
Vessels and cavities
What is simple cuboidal epithelia used for?
Kidneys or bronchioles
What is simple columnar epithelia used for?
GI tract or uterine tubes
What is stratified squamous epithelia used for?
Skin and oesophagus
What is stratified cuboidal/columnar epithelia used for?
Sweat gland duct
What is pseudo-stratified epithelia used for?
Respiratory epithelium
What are the features of surface epithelia?
- Basement membrane
- Polarity
- Contiguous and adhesive
- No direct blood supply
- High mitotic activity
What are the apical specialisations of surface epithelia?
- Microvilli
- Cilia
What is the basement membrane comprised of?
- Basal lamina
- Reticular lamina
What are the two types of glandular epithelium?
Exocrine and endocrine
What does exocrine epithelia involve?
Merocrine, apocrine and holocrine
What does endocrine epithelia involve?
Secretion from the base of the cell
How do you classify glandular epithelia?
- Secretion
- Duct
- Secretory portion
What types of glandular secretion are there?
- Mucous (glycoproteins + water)
- Serous (proteins + water)
- Mixed
What types of glandular ducts are there?
Simple or compund
What types of secretory portions are there?
Unicellular or multicellular (tubular, coiled or alveolar)
