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4 / 13  The muscles of a professional sprinter are most likely to have ________.
A  80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibers
B  20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibers
C  50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibers
D  40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibers

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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