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Introduction to Biotechnology

Animal tissues: Animal tissues are classified into four types based on the functions they perform: Epithelial, Connective, Muscular and Nervous tissue.

  • Epithelial tissues –Tightly packed cells with almost no intercellular spaces. It forms the covering of the external surfaces, internal cavities, and organs of the animal body
  • Various types of epithelial tissues:
  • Squamous epithelium - Single layer of extremely thin and flat cells are called simple squamous epithelium while multi layered cells forms stratified squamous epithelium in order to prevent wear and tear
  •   Location in the human body:
      • Simple squamous epithelium - Lining of the mouth, oesophagus, lung alveoli, etc.
      • Stratified  squamous epithelium – Skin
  • Cuboidal epithelium - Consists of cube-like cells that provide mechanical support
    • Location in the human body:Lining of kidney tubules and ducts of the   salivary glands
  • Columnar epithelium - Consists of elongated or column-like cells to facilitate movement across the epithelial barriers.
    • Location in the human body: Inner lining of the intestine and gut
  • Glandular epithelium - Consists of multicellular glands


Connective tissues -Specialised to connect various body organs. Various types of connective tissues are: 

Loose connective tissue- It includes areolar and adipose connective tissues

  • Areolar tissue - It provides supports to internal organs and helps in  repair of tissues
    • Found in the skin and muscles, around the blood vessels, nerves, etc.
  • Adipose tissue - Acts as the storage site of fats; found between the internal organs and below the skin; acts as…

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