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28 September, 02:34

What is a muscle fiber? the myosin that makes up the contractile unit of a muscle cell the connective tissue outer covering of a muscle a group of muscle cells that make up the same muscle group a single cell of a muscle?

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  1. 28 September, 02:48
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    The release of calcium ions initiates muscle contractions ... The contraction of a striated muscle fiber occurs as the sarcomeres, linearly arranged within myofibrils, shorten as myosin heads pull on the actin filaments.
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