Squamous epithelial cells are found in the inner lining of
- A.Oesophagus.
- B.Small intestine.
- C.Ducts of salivary gland.
- D.Kidney.
Correct answer
Explanation
The correct answer is A, Oesophagus. The oesophagus, like the mouth, is lined by flat squamous epithelium that protects it from wear as food passes.
Epithelial tissue covers body surfaces and lines organs, and its cells are named by shape. Squamous cells are thin and flat like tiles; in the oesophagus and the skin they are stacked in many layers, called stratified squamous epithelium, to resist friction. A single layer of squamous cells lines blood vessels and the air sacs of the lungs, where substances must pass through easily. Cuboidal cells are cube-shaped and columnar cells are tall, each suited to secretion or absorption.
B, the small intestine, is lined by columnar epithelium, whose tall cells absorb digested food.
C, the ducts of salivary glands, are lined by cuboidal epithelium.
D, the kidney tubules, are lined mainly by cuboidal epithelium, which helps in reabsorption.
Exam tip: squamous, oesophagus, mouth, alveoli; cuboidal, kidney tubules and gland ducts; columnar, intestine.
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