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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/biology/human-biology/muscles/v/myosin-and-actin How myosin and actin interact to produce mechanical force. . Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/nclex-rn ...
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