3. (10 points) A. Match the component of a muscle to the definition. A motor neuron and all of the muscle fibers that it innervates The actual muscle cell The "thin filament" associated with troponin and tropomyosin The functional unit of a striated muscle cell In the sliding filament model, ATP binds to the "head" of this a. Muscle fiber. B. myosin. C. motor unit. D. sarcomere. E. actin
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James K.
6. Which of the following is one of the proteins in the thick myofilament? A. Myosin C. Actin B. Titin D. Dystrophin 7. The structural and functional unit of skeletal muscle is the: A. Sarcolemma C. Sarcomere B. Actin myofilament D. Myosin myofilament 8. Functions of muscle include all of the following, EXCEPT: A. maintenance of posture C. movement of the body B. production of heat D. communication 9. The plasma membrane of a muscle cell is called the: A. Sarcolemma C. Sarcomere B. Sarcoplasm D. Epimysium 10. Calcium ions are found stored in the: A. Perimysium C. Transverse tubule B. H zone D. Terminal cisternae
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Which of the following statements is true? a. A muscle fiber is a collection of cells embedded in connective tissue. b. A sarcomere contains both actin and myosin molecules arranged in a parallel fashion. c. The function of Ca2+ in contraction is to bind to tropomysin. d. Myofibrils are individual muscle cells. e. The I band of a sarcomere is the region where thin and thick filaments overlap.
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