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Cilia

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General Biology I

Definition

Cilia are hair-like structures that extend from the surface of many eukaryotic cells. They play crucial roles in movement and sensory functions.

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5 Must Know Facts For Your Next Test

  1. Cilia are made up of microtubules arranged in a '9+2' structure.
  2. They can be motile (for movement) or non-motile (for sensory functions).
  3. Motile cilia beat in a coordinated manner to move fluid or mucus across cell surfaces.
  4. Non-motile cilia, also known as primary cilia, act as sensory organelles.
  5. Defects in cilia function can lead to diseases known as ciliopathies.

Review Questions

  • What is the structural arrangement of microtubules in cilia?
  • What are the two main types of cilia and their functions?
  • How do defects in ciliary function affect human health?
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