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6:11
Study.com
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Muscle Contraction Steps | How Do Muscles Contract?
What happens when a muscle contracts? Learn about the muscle contraction process and the role of the proteins actin and myosin in muscle contraction, as well as the types of muscle contraction and regulatory proteins.
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Getting the right amount of calcium every day is important for keeping your bones healthy throughout your life. But what is the right amount? And when should you consider taking a calcium supplement? Learn more in this Mayo Clinic Minute: http://mayocl.in/2qHNAjE. | Mayo Clinic
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