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…