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Squamous epithelial cells are found in the inner lining of
1. Oesophagus
2. Small intestine
3. Ducts of salivary gland
4. Kidney

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Correct Answer - Option 1 : Oesophagus

The correct answer is Oesophagus.

  • An epithelial tissue or epithelium has a free surface, which faces either a body fluid or the outside environment and thus provides a covering or a lining for some part of the body.
  • The cells are compactly packed with a little intercellular matrix.
  • There are two types of epithelial tissues namely simple epithelium and compound epithelium.
    • Simple epithelium is composed of a single layer of cells and functions as a lining for body cavities, ducts, and tubes.
    • Compound epithelium consists of two or more cell layers and has a protective function as it does in our skin.
  • Squamous epithelial cells are found in the inner lining of the oesophagus.

  • On the basis of structural modification of the cells, the simple epithelium is further divided into three types:
    • Squamous:
      • The squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries.
      • They are found in the walls of blood vessels, oesophagus, and air sacs of the lungs and are involved in functions like forming a diffusion boundary. 
    • Cuboidal:
      • The cuboidal epithelium is composed of a single layer of cube-like cells.
      • This is commonly found in ducts of glands and tubular parts of nephrons in kidneys and its main functions are secretion and absorption. 
    • Columnar:
      • The columnar epithelium is composed of a single layer of tall and slender cells.
      • Their nuclei are located at the base. 
      • They are found in the lining of stomach and intestine and help in secretion and absorption.

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