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Best Answer: Slow twitch. Slow twitch is the kind of muscle fiber that enables the muscles to exert force for a long period time. 
CJmad8
I highly recommend picking up a books called "Anatomy and Physiology" by McGraw-Hill. Amazing book. Everything you need to know or need answered is in that book :)

The answer is Slow-Twitch Fibers. They allows muscle to excert forces and MANY more things :)
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