what is epithelial tissue? mention diffrent types of epithelial tissue
Answers
Answer:
Key facts
Cell shape classification
Squamous, cuboidal, columnar
Cell layer classification
Simple, stratified, pseudostratified, transitional
Main features
Contiguous cells
Polarity (apical, lateral and basal cell surfaces)
Intercellular junctions
Basement membrane (extracellular matrix)
Supported by connective tissue (lamina propria)
Avascular, innervated
Specialisations
Apical: microvilli, cilia, stereocilia, modified stereocilia (sensory receptors)
Secreting: tubular, acinar and tubuloacinar glands
Functions
Secretion, absorption, transportation, protection, receptor function (sensation)
Simple epithelial tissues are generally classified by the shape of their cells. The four major classes of simple epithelium are: 1) simple squamous; 2) simple cuboidal; 3) simple columnar; and 4) pseudostratified.