Epithelial Classification

Question 1

Main 2 criterial for epithelial classification

Answer 1

Shape - squamous cuboidal, columnar

Layering - single layered and multi layered so stratified

Question 2

Where is single squamous epithelium found?

Answer 2

Lung alveolar, epithelium mesothelium (major body cavities), endothelium (linking of blood vessels).

Thin epithelium allows for exchange to occur

Question 3

Simple cuboidal epithelium?

Answer 3

Lining of the ducts such as the kidney collecting ducts

Question 4

Simple columnar epithelium?

Answer 4

Typical of arrangements of absorption and secretion of molecules.
Such as enterocytes to breakdown products of digestion

Question 5

Types of stratified squamous epithelium?

Answer 5

Keratinising - produce keratin so when they die they become thicker, stronger, protective structures. Epidermis, skin epithelium. Such cells lose their cellular organelles and nuclei not visible under light microscope (not visible cell layers) protect from physical, chemical insults.

Non keratinising - not undergo keratinisation. They retain nuclei and organelles (lining of mouth oesophagus, anus, cervix and vagina). These also protect

Question 6

Pseudo stratified epithelium

Answer 6

Apical cells have contact with basal lamina. - appears to be multi layered but actually surface cells have contact with basal lamina.

Airway (trachea and bronchi). Epithelium, various ducts in urinary and retro tracts.