Transcription: The 41st mission used rats to examine the behavior of muscle fibers in a space environment. The experiment involved the measurement of myosin, a protein found in muscle fibers. Scientists classify these fibers into two groups, slow twitch muscles, which contain low levels of myosin and help support the body against gravity, and fast twitch muscles, which contain high levels of myosin and help in body motion. In space, the zero-gravity environment reduces the stimuli to the support, or slow twitch muscles. Therefore, scientists tested the levels of myosin in the rat muscles to determine if ther ...
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