Health Care > EXAM > NSCA-CSCS Exam Chapter 1 | 100 Questions with 100% Correct Answers | Updated & Verified (All)

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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 exc... ite 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 From what is the heart's electrical impulse normally initiated? - ANS - SA Node Which of the following occurs during the QRS complex of a typical ECG? - ANS - repolarization of the atrium and depolarization of the ventricle. A-Band - ANS - overlapping actin and myosin acetylcholine - ANS - Arrival of the action potential at the nerve terminal causes release of a neurotransmitter, ______, which diffuses across the neuromuscular junction. Once a sufficient amount is released, an action potential is generated across the sarcolemma, and the (muscle)fiber contracts. Actin and Myosin - ANS - contractile proteins in muscle [Show More]

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