Animation 11.13: Myosin and Actin Cause a Muscle to ContractClick on the above link to access the Interactive eBook. Once you've signed in, scroll to page 327 and watch the video. When you've finished watching the video, come back to the test and answer the following questions:What are the muscles of the body made up of?
A. acetylcholine and calcium
B. axons and protein channels
C. sensory and motor neurons
D. myosin and actin
Answer: D
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