![]() Sarcoplasm, the cytoplasm of a muscle cell, contains high amounts of myoglobin, an oxygen-binding protein, and calcium ions, which regulate muscle contraction. These myofilaments are composed of two cytoplasmic proteins, actin and myosin. Myofibers are filled with myofilaments that run parallel to the length of the cell and that are responsible for the process of contraction. Because they are long and narrow, they are often called muscle fibers, or myofibers. Muscle cells are elongated and arranged in parallel bundles that correspond to the direction of contraction. Muscle contraction, or shortening, generates force that is used to create bodily movements or change the shape of an internal organ. ![]() ![]() Muscles are bundles of muscle tissue that specialize in contraction.
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