CSCS Practice Exam questions with correct answers
1. To which of the following structures do the cross-bridges attach during muscle action? a. actin b. myosin c. M-bridge d. sarcolemma Answer actin 2. Which of the following substances regulates muscle actions? a. potassium b. calcium c. troponin d. tropomyosin Answer calcium 3. Which of the following substances acts at the neuromuscular junction to excite the muscle fibers of a motor unit? a. acetylcholine b. ATP c. creatine phosphate d. serotonin Answer acetylchooline
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cscs practice exam questions with correct answers
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