because Slow twitch muscle fibers. They help enable long endurance, which would be useful for marathon length running. Skeletal muscle fiber is encircled by a plasma membrane called the sarcolemma, which holds sarcoplasm, the cytoplasm of muscle cells. It gives the cell its striated appearance.
<span>Slow twitch muscle fibers. They help enable long endurance, which would be useful for marathon length running.
Skeletal muscle fiber is encircled by a plasma membrane called the sarcolemma, which holds sarcoplasm, the cytoplasm of muscle cells. It gives the cell its striated appearance.</span>
