2024 NSCA CSCS Exam Chapter 1 Latest Questions With Complete Grade A Answers

2024 NSCA CSCS Exam Chapter 1 Latest Questions With Complete Grade A Answers 1. To whatstructures do the cross-bridges attach during muscle action? Answer: Actin 2. Which substance regulates muscle actions? Answer: Calcium 3. Which substance acts at the neuromuscular junction to excite the musclefibers of a motor unit? Answer: Acetylcholine 4. Which muscle fibertype isthe MOST beneficial for a marathon runner? Answer: TypeI 5. 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? Answer: Muscle spindle 6. From what is the heart's electrical impulse normally initiated? Answer: SA Node 7. Which of the following occurs during the QRS complex of a typical ECG? Answer: - repolarization of the atrium and depolarization of the ventricle. 8. A-Band Answer: overlapping actin and myosin 9. Arrival of the action potential at the nerve terminal causesreleaseof 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. Answer acetylcholine 10. Actin and Myosin Answer: contractile proteins in muscle