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NSCA-CSCS Exam Chapter 1 | 100 Questions with 100% Correct Answers | Updated & Verified
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To what structures do the cross-bridges attach during muscle action? - ANS - Actin Which substance regulates muscle actions? - ANS - Calcium Which substance acts at the neuromuscular junction to excite the muscle fibers of a motor unit? - ANS - Acetylcholine Which muscle fiber type is the MOST beneficial for a marathon runner? - ANS - Type I When throwing a baseball, an athlete's arm is rapidly stretched just prior to throwing the ball. Which of the following structures detects and responds to that stretch by reflexively increasing muscle activity? - ANS - Muscle Spindle
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