A&P2 Ch. 10 Muscular System Test

29. What is the role of acetylcholinesterase? A. To bind acetylcholine to its ligand-gated Na+ channel receptor B. To remove and breakdown acetylcholine from the channel receptor C. To create a new action potential on the sarcolemma D. All of the choices are roles of acetylcholinesterase

B

5. The ability of muscle to respond to a stimulus is A. Contractility B. Excitability C. Extensibility D. Elasticity

B

9. Which of the following is true of smooth muscle? A. Visceral cells connected by intercalated disks B. Non-striated, spindle-shaped cells C. Under voluntary control D. Found attached to bones

B

12. What is the plasma membrane of a muscle fiber called? A. Sarcoplasm B. Sarcomere C. Sarcolemma D. Endomysium

C

14. Which of the following is also known as the thin myofilament? A. Myosin B. Titin C. Actin D. Troponin

C

2. Which of the following is a function of smooth muscle? A. Communication B. Production of body heat C. Constriction of organs and vessels D. Respiration

C

21. The structural and functional unit of skeletal muscle is the A. Sarcolemma B. Actin myofilament C. Sarcomere D. Myosin myofilament

C

23. The binding of acetylcholine to a ligand-gated channel will allow ____ to enter the muscle fiber. A. Calcium ions B. Potassium ions C. Sodium ions D. All of the choices are correct

C

24. What kind of gated ion channel responds to small changes in voltages across the plasma membrane? A. Ligand-gated ion channel B. Steroid-gated ion channel C. Voltage-gated ion channel D. Messenger-gated ion channel

C

25. Which of the following is NOT part of a neuromuscular junction? A. Motor end-plate B. Presynaptic terminal (axonal endings) C. Sarcoplasmic reticulum D. Synaptic cleft

C

28. By what process does acetylcholine move to the postsynaptic membrane? A. Active transport B. Endocytosis C. Diffusion D. Osmosis

C

31. Extensions of the sarcolemma into the interior of the muscle fiber are called A. Cisternae B. Sarcoplasmic reticulae C. T tubules D. Triads

C

32. What is the direct cause of the release of calcium ions from the sarcoplasmic reticulum? A. Acetylcholine binding to the receptor on the Na+ gated channel B. Calcium being released into the presynaptic terminal C. The action potential traveling into the T tubules D. Potassium flowing out of the postsynaptic membrane

C

34. What attaches to the myosin head causing it to detach from actin after a power stroke occurs? A. ACh B. ADP C. ATP D. Calcium

C

6. The ability of muscle to contract when stretched or extended is A. Contractility B. Excitability C. Extensibility D. Elasticity

C

8. Which of the following is NOT true of skeletal muscle? A. Long, cylindrical fibers B. Multiple nuclei C. Totally under involuntary control D. Has striations

C

11. What type of connective tissue surrounds individual muscles? A. Epimysium B. Perimysium C. Muscular fascia D. Endomysium

A

15. Which of the following is also known as the thick myofilament? A. Myosin B. Titin C. Actin D. Troponin

A

16. Which molecule covers the myosin active site on the actin? A. Tropomyosin B. Troponin C. Titin D. M line

A

22. What type of gated-ion channel responds to a molecule binding to a receptor on the ion channel? A. Ligand-gated ion channel B. Steroid-gated ion channel C. Voltage-gated ion channel D. Messenger-gated ion channel

A

3. Which type of muscle is needed for propelling blood throughout the body? A. Cardiac B. Smooth C. Skeletal D. all of the above

A

30. The mechanism by which an action potential in the sarcolemma causes a muscle contraction is called A. Excitation-contraction coupling B. Sliding-filament model C. Synaptic excitation D. Cross-bridge cycling

A

33. What is released from the myosin head when the cross-bridge with actin is formed? A. Phosphate B. sodium C. ATP D. Calcium

A

36. Which of the following is NOT a phase of a muscle twitch? A. Interphase B. Contraction phase C. Latent phase D. Relaxation phase

A

4. The ability of muscle to shorten forcefully is A. Contractility B. Excitability C. Extensibility D. Elasticity

A

1. 1. Which of the following is NOT a function of skeletal muscle? A. Body movement B. Constriction of organs C. Production of body heat D. Maintenance of posture

B

13. Myofibrils are formed from ____________ that are joined end to end. A. Actin myofilaments B. Sarcomeres C. Myosin myofilaments D. Sarcolemmas

B

17. Which molecule has a binding site for calcium? A. Tropomyosin B. Troponin C. Titin D. M line

B

18. The I band (includes 2 different sarcomeres) is made up of A. Myosin and titin B. A Z disk and actin C. The M line and Z disk D. Actin and myosin

B

20. The H zone is where A. There is only actin B. There is only myosin C. There is only the Z disk D. There is only titin

B

26. What ion is necessary for the release of acetylcholine from the synaptic vesicles? A. Sodium B. Calcium C. Chloride D. Potassium

B

27. Depolarization of a muscle fiber involves ____ diffusing into the muscle fiber. A. calcium B. sodium C. potassium D. magnesium

B

10. What type of connective tissue surrounds individual muscle fibers? A. Epimysium B. Perimysium C. Muscular fascia D. Endomysium

D

19. The A band is made up of A. Myosin and titin B. A Z disk and actin C. The M line and Z disk D. Actin and myosin

D

35. Which of the following is NOT involved in the process of muscle relaxation? A. The sarcoplasmic reticulum actively reclaims calcium ions using ATP B. The troponin-tropomyosin complex blocks the active site on actin again C. ATP is used for cross-bridge release D. all of the above occur during relaxation

D

7. The ability of muscle to recoil to its resting length after being stretched is A. Contractility B. Excitability C. Extensibility D. Elasticity

D