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Epithelial tissues always exhibit polarity; that is, they have a free surface and a basal surface. false true

Sagot :

Epithelial tissues have apical and basolateral surface which is separated by different cellular junctions.

What are epithelial tissues?

Epithelial tissues forms the protective lining of various body surfaces. Various body cavities and several glands contain epithelial tissues.

Epithelial tissues are important because of their function of protection, secretion and absorption.

The general structure of epithelial tissues consists of a cell-membrane, nucleus and a cytoplasm.

Based on the number, epithelial tissues are classified as:

  • Simple epithelial cells - made up of single cell layer.
  • Stratified epithelial cells- made up of multiple cell layers.

Based on their shape, epithelial tissues are further classified into:

  • Simple squamous and stratified squamous epithelial cells
  • Simple columnar and stratified columnar epithelial cells
  • Simple cuboidal cells
  • Ciliated columnar and pseudostratified columnar epithelial cells
  • Transitional epithelial cells.

Therefore, epithelial tissues are important in protecting the internal and external body organs.

Learn more about epithelial tissues, here:

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