Which of the following is a function of epithelial tissues? 

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.