Which of the following is a function of epithelial tissues? 

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RRB Technician Grade III Official Paper (Held On: 29 Dec, 2024 Shift 2)
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  1. Provides response to stimulus 
  2. Protection 
  3. Storage of fats 
  4. Responsible for involuntary movements 

Answer (Detailed Solution Below)

Option 2 : Protection 
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The correct answer is 2) Protection.

Key Points

  • Epithelial tissues act as a protective barrier against mechanical injury, pathogens, and chemical exposure.
  • They cover the body surface and line body cavities, providing a first line of defense.
  • Specialized epithelial cells, like those in the skin, prevent water loss and protect against environmental damage.
  • Certain epithelial cells have cilia and mucous production capabilities to trap and remove foreign particles.

Additional Information

  • Types of Epithelial Tissues:
    • Squamous Epithelium: Thin and flat cells that facilitate diffusion and filtration.
    • Cuboidal Epithelium: Cube-shaped cells that function in secretion and absorption.
    • Columnar Epithelium: Tall and column-like cells specialized for absorption and secretion.
  • Functions Beyond Protection:
    • Absorption: Epithelial cells in the intestines absorb nutrients from food.
    • Secretion: Glandular epithelial cells produce and release substances like enzymes and hormones.
    • Sensory Reception: Certain epithelial cells are involved in sensory perception, such as taste buds on the tongue.
  • Regeneration:
    • Epithelial tissues have a high capacity for regeneration, allowing for quick repair of injuries.
    • This regenerative ability is crucial for maintaining the integrity of barriers and surfaces.
  • Basement Membrane:
    • A thin, fibrous layer that supports epithelial cells and anchors them to underlying connective tissue.
    • The basement membrane is essential for tissue stability and cell signaling.
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