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Muscle Physiology Chapter Exam

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Page 1

Question 1 1. Consider a drug that inhibits the acetylcholine receptor in the neuromuscular junction. Which of the following would be a likely side effect of this drug?

Question 2 2. Which of the following muscle parts is the smallest in cross sectional area?

Question 3 3. A lack of ATP and a continuous binding of calcium to troponin is MOST likely to cause which of the following conditions to set in?

Question 4 4. Rapid contractions of skeletal muscle in the body are responsible for the regulation of WHAT element?

Question 5 5. Which of the following is composed of muscle tissue surrounding a hollow organ?

Page 2

Question 6 6. Which proteins form a cross-bridge, causing muscular contraction?

Question 7 7. In the sequence of bodily movement, a contracted muscle _____ a body part to create the motion?

Question 8 8. Autonomic motor neurons would cause which of the following physiological reactions in the human body?

Question 9 9. Within the individual myofibril of the muscle cell are repeating units that run end-to-end along the length of the myofibril. What are these units called?

Question 10 10. Which statement is true of the muscle length in an isometric contraction?

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Question 11 11. Actin and myosin filaments form _____, or the long, contractile threads located in striated muscle cells?

Question 12 12. The two primary types of muscle contractions are muscle shortening known as concentric contractions, and _____ contractions, where the muscle elongates?

Question 13 13. In the search for his shoes, Jack stepped on a nail. The pain caused him to step back and fall. Which type of muscle tissue, or tissues, aided in Jack's reaction?

Question 14 14. Tetanic contraction is produced when repeated stimuli is administered during which part of the muscle twitch?

Question 15 15. Hollow organs found in the body are composed of WHAT type of muscle?

Page 4

Question 16 16. Consider a drug that inhibits ATP synthesis. What effect would this drug have on muscle tissue?

Question 17 17. What structure attaches a skeletal muscle to a bone?

Question 18 18. An isolated muscle is stimulated with increasing stimulus strength. Stimuli of 10, 15 and 20 mV produced no response, while 25 mV produced a small contraction. Which of the following is the threshold stimulation?

Question 19 19. Actin is a thin, contractile protein that is a component of the _____, or the functional unit of striated muscle?

Question 20 20. The connective tissue that surrounds each fascicle in the fascicular arrangement of skeletal muscles is known as _____?

Page 5

Question 21 21. Marcy is using an electrical muscle stimulator for fifteen minutes, twice a day, in an effort to rebuild muscle strength in her leg following knee surgery. Once Marcy attaches the electrodes, the muscle in her leg is contracted for ten seconds, followed by twenty seconds of rest. The time where her muscle is NOT being contracted is known as the _____.

Question 22 22. Which of the following are the contractile proteins responsible for muscle contraction?

Question 23 23. In the neuromuscular pathway at a chemical synapse, what must first occur for the postsynaptic cell to receive a signal?

Question 24 24. Which of the following occurs first in a single cross bridge cycle, beginning with the high-energy/attached stage?

Question 25 25. Slow muscle fibers are best characterized by which of the following descriptions?

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Question 26 26. Muscles are composed of _____, which are made up of multiple muscle fibers innervated by a single motor neuron.

Question 27 27. Which of the following structures are optimally arranged to maximize contraction?

Question 28 28. During which stage of the cross-bridge cycle does the sarcomere shorten?

Question 29 29. Which of the following connects one sarcomere with another along the length of the myofibril?

Question 30 30. Maximization of muscle contraction is directly related to WHAT design feature of human muscles?

Muscle Physiology Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next question. You can skip questions if you would like and come back to them later with the "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. You will lose your work if you close or refresh this page. Good luck!

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