NSCA CSCS EXAM REVIEW questions with correct answers
Which of the following substances regulates muscle actions? potassium calcium troponin tropomyosin Answer calcium Which of the following substances acts at the NMJ to excite the muscle fibers of a motor unit? acetylcholine ATP creatine phosphate serotonin Answer acetylcholine When throwing a baseball, an athlete's arm is rapidly stretched just before throwing the ball. Which of the following structures detects and responds to that stretch by reflexively increasing muscle activity? golgi tendon organ muscle spindle extrafusal muscle pacinian corpuscle Answer muscle spindle
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