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  • Epithelial tissue covers the whole surface of the body.
  • Epithelial tissues are made up of cells that are closely packed and are composed of one or more layers.
  • This tissue is specialised to form the covering of all internal and external body surfaces.
  • Epithelial tissue that occurs on surfaces on the interior of the body is known as endothelium.
  • It acts as a barrier to keep different body parts separate.
  • Anything that enters the body has to cross any one of the above mentioned epithelial tissues.

SQUAMOUS EPITHELIAL TISSUE

  • Cells are flat and thin.
  • Consist of single layer of flat cells in contact with the basal lamina.
  • The skin that protects our body is made up of squamous epithelium. As they are arranged in many layers they are called as stratified squamous epithelium.
  • They are found where rapid diffusion is required.
  • They are found in Capillaries (blood capillaries), glomerulus (part of excretory system).
  • Present in: esophagus, lining of buccal cavity.

CUBOIDAL EPITHELIAL TISSUE

  • These are cube shaped cells.
  • Nucleus is located at the centre.
  • The cells of cuboidal epithelium perform the function of secretion and absorption.
  • This epithelial tissue fold inward and form a Multicellular gland called GLANDULAR EPITHELIUM.
  • Found in: lining of kidney tubules, surface of ovaries, linings of nephrons, duct of salivary glands.

COLUMNAR EPITHELIAL TISSUE

  • They are pillar like or rod shaped.
  • When these tissues bear cilia on them they are known as CILIATED COLUMNAR EPITHELIAL tissues.
  • Cilia are hair like outgrowth of small size which helps in passage of the substance from one part to other.
  • Present in: inner lining of intestine, stomach, parts of respiratory and reproductive as well as digestive system.

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