Final answer:
The exact percentage of how much faster skin cells renew during sleep compared to when awake is not provided in the options and thus cannot be determined. However, professional sprinters are likely to have around 80% fast-twitch muscle fibers favorable for sprinting.
Step-by-step explanation:
The question regarding how much faster skin cells renew during sleep compared to when awake does not provide a factual answer in the given options. Therefore, it is not possible to state whether skin cells renew at 10%, 20%, 30%, or 50% faster rates during sleep. It is known that the body, including skin cells, undergoes repair and renewal processes during sleep, and certain hormonal changes that promote cell repair and growth are more active during this time. However, quantifying the exact percentage increase in renewal rate during sleep compared to when awake is not specified in current scientific literature.
Concerning the muscles of a professional sprinter, they are most likely to have approximately 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibers. Fast-twitch fibers are crucial for sprinters because they provide quick, forceful contractions, making them essential for speed and power activities.