NSCA-CSCS Exam Chapter 1 Questions & Answers 100%accurate!

NSCA-CSCS Exam Chapter 1 Questions & Answers 100%accurate!To what structures do the cross-bridges attach during muscle action? - ANSWERActin Which substance regulates muscle actions? - ANSWERCalcium Which substance acts at the neuromuscular junction to excite the muscle fibers of a motor unit? - ANSWERAcetylcholine Which muscle fiber type is the MOST beneficial for a marathon runner? - ANSWERType 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? - ANSWERMuscle Spindle From what is the heart's electrical impulse normally initiated? - ANSWERSA Node Which of the following occurs during the QRS complex of a typical ECG? - ANSWERrepolarization of the atrium and depolarization of the ventricle. A-Band - ANSWERoverlapping actin and myosin acetylcholine - ANSWERArrival 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 - ANSWERcontractile proteins in muscle