In the context of muscle contraction, actin filaments interact with which motor protein?
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Correct answer: Myosin, which binds actin and uses ATP
Myosin is the motor protein that directly interacts with actin filaments. In muscle cells, myosin II heads bind to actin and undergo ATP-driven conformational changes that generate the sliding force responsible for sarcomere shortening. Dynein and kinesin are microtubule-based motors, while troponin regulates actin-myosin interaction but is not itself a motor protein.
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