Microfilaments

Definition

Microfilaments are thin, thread-like structures composed of actin proteins. They play a crucial role in cell shape, movement, and division.

5 Must Know Facts For Your Next Test

1. Microfilaments are primarily made of actin proteins.
2. They are approximately 7 nm in diameter, making them the thinnest filaments in the cytoskeleton.
3. Microfilaments are essential for muscle contraction through their interaction with myosin.
4. They contribute to cellular processes like cytokinesis during cell division.
5. Microfilaments enable amoeboid movement and cytoplasmic streaming by polymerizing and depolymerizing.

Review Questions

• What proteins primarily compose microfilaments?
• How do microfilaments contribute to muscle contraction?
• Describe the role of microfilaments in cell division.

Related terms

Cytoskeleton:

A network of protein fibers that provide structural support and shape to cells.

Actin: A protein that forms microfilaments and is involved in various types of cell movement.

Myosin: A motor protein that interacts with actin to facilitate muscle contraction and other cellular movements.