NSCA CSCS Exams (Latest 2023/ 2024 Updates STUDY BUNDLE WITH COMPLETE SOLUTIONS) Questions and Verified Answers | 100% Correct| Grade A

Which of the following substances regulates muscle actions? potassium calcium troponin tropomyosin calcium Which of the following substances acts at the NMJ to excite the muscle fibers of a motor unit? acetylcholine ATP creatine phosphate serotonin 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 muscle spindle From which of the following is the heart's electrical impulse normally initiated? AV node SA node the brain the sympathetic nervous system SA node Which of the following occurs during the QRS complex of a typical ECG? 1. depolarization of the atrium 2. repolarization of the atrium 3. repolarization of the ventricle 4. depolarization of the ventricle a. 1 and 3 only b. 2 and 4 only c. 1, 2, and 3 only d. 2, 3, and 4 only b. 2 and 4 only Which of the following is the definition of power? mass x acceleration force x distance force x velocity torque x time force x velocity To compare performances of Olympic weightlifters of different body weights, the classic formula divides the load lifted by the athlete's body weight body weight squared lean body weight body weight to the two-thirds power body weight to the two-thirds power During a free weight exercise, muscle force varies with which of the following? 1. perpendicular distance from the weight to the body joint 2. joint angle 3. movement acceleration 4. movement velocity squared a. 1 and 2 only b. 1 and 4 only c. 1, 2, and 3 only d. 2, 3, and 4 only a. 1 and 2 only (perpendicular distance from the weight to the body joint AND joint angle) A vertical jump involves knee, hip, and shoulder movement primarily in which of the following anatomical planes? sagittal perpendicular frontal transverse sagittal