Actin filaments are held together by structures known as Z lines. A sarcomere is the area between two Z lines. Myosin filaments overlap actin filaments within a sarcomere.
What is Actin filaments ?
- Actin filaments are especially abundant beneath the plasma membrane, where they form a network that provides mechanical support, determines cell shape, and allows surface movement, allowing cells to migrate, engulf particles, and divide.
- Actin is a protein that forms filaments that provide mechanical support and driving forces to cells. Actin helps biological processes such as sensing environmental forces, internalising membrane vesicles, moving across surfaces, and dividing the cell in half.
- Two long strands of beadlike actin molecules are twisted together to form a thin filament in muscle, the bundles of which alternate and interdigitate with bundles of thick filaments formed of myosin, the most abundant protein in muscle.
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