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Final answer:
Sarcoplasm is the cytoplasm of a muscle fiber, housing the sarcoplasmic reticulum and essential contractile proteins such as myosin and actin.
Explanation:
Sarcoplasm is the cytoplasm of a muscle fiber. It is where the sarcoplasmic reticulum (SR) is located, a specialized form of endoplasmic reticulum that stores and releases calcium ions. The sarcomere is the smallest contractile unit of a muscle fiber, composed of thick filaments (myosin) and thin filaments (actin) which create the striations in muscle fibers.
Learn more about Sarcoplasm in muscle fibers here:
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