1. 1. What are the three types of muscles found in the muscular system A. Skeletal, cardiac, muscle fibers B. Skeletal, cardiac, smooth C. Skeletal, smooth, connective D. Smooth, cardiac, connective

2. 2. The contraction of a muscle is due to the movement of A. Skeletal muscle B. Muscle fibers C. Myofibrils D. sarcolemma

3. 3. Striated, multi-nucleated cells belong to A. Skeletal muscle B. Cardiac muscle C. Smooth muscle D. Connective tissue

4. 5. All muscles are involved in A. Movement B. Digestion C. Posture D. support

5. 7. Muscle cells are surrounded and bundled by A. Tendons B. Muscle fibers C. Ligaments D. Connective tissue

6. 8. The prefix that is used when referring to muscle structure A. Myo, mys B. Mys, endo C. Epi, endo D. Myo, peri

7. 9. All of the following are functions of skeletal muscles EXCEPT A. Posture B. Heat generation C. Movement D. physique

8. 10. The connective tissue that wraps and protects each individual muscle fiber A. Epimysium B. Perimysium C. Endomysium D. fascia

9. 11. The connective tissue that surround and protects the fascicle A. Epimysium B. Perimysium C. Endomysium D. fascia

10. 12. Another name for muscle fiber is A. Sarcolemma B. Sarcomere C. Muscle cell D. Myofibril

11. 13. The _____________ is the plasma membrane of the muscle fiber A. Sarcolemma B. Sarcomere C. Sarcoplasmic reticulum D. Myosin filament

12. 14. This organelle is responsible for the shortening of the muscle during contraction A. Sarcolemma B. Sarcomere C. Sarcoplasmic reticulum D. Myofibril

13. 15. Thick filaments are composed of the protein A. Actin B. Myosin C. Insulin D. Leucine

14. 16. The thin filaments are anchored to the Sarcomere by the A. I band B. A band C. H zone D. Z disc

15. 17. One motor neuron and all the skeletal muscle cells stimulated by that neuron is called a A. Fascicle B. Nerve bundle C. Motor unit D. Motor cell

16. 18. The junction between the axon terminal and the muscle it is stimulating A. Synaptic cleft B. Neuromuscular junction C. Synaptic junction D. Neurotransmitter junction

17. 19. When an action potential reaches the axon terminal, ____________ are released A. Neurons B. Vesicles C. Neurotransmitters D. hormones

18. 20. The specific neurotransmitter involved in skeletal muscle contraction is A. Adenosine triphosphate B. Adenosine diphosphate C. Deoxyribonucleic acid D. Acetyl Choline

19. Energy for muscle contraction primarily comes from A. ATP B. ADP C. Ach D. CP

20. 24. During a contraction the __________ gets shorter A. Sarcomere B. Neuromuscular junction C. Motor Unit D. neurotransmitter

21. The protein actin is found on the A. Thick filament B. Myosin C. Thin filament D. Muscle cell

22. 26. Ca⁺ is stored and released by the A. Sarcoplasmic reticulum B. Nucleus C. Sarcomere D. Myofibril

23. 27. During contraction the ________ slide over the ____________, taking up the space of the ___________ A. Thick filaments, thin filaments, bare zone B. Thin filaments, thick filaments, bare zone C. Thin filaments, thick filaments, z disc D. Thick filaments, thin filaments, z disc

24. 28. The previous action is part of the A. Sliding filament theory B. Graded response C. Extensibility D. contractility

25. 29. Ability to receive and respond to a stimulus A. Excitability B. Contractility C. Extensibility D. Elasticity

26. 30. Ability of muscle cells to shorten when an adequate stimulus is received A. Excitability B. Contractility C. Extensibility D. Elasticity

27. 31. Ability of muscle cells to be stretched A. Excitability B. Contractility C. Extensibility D. Elasticity

28. 32. Ability of muscle cells to recoil and resume resting length after stretching A. Excitability B. Contractility C. Extensibility D. Elasticity

29. Study diagram Muscle fiber Endomysium Fascicle Perimysium epimysium

30. Muscle fiber diagram Has nucleus so it MUST be the muscle cell – Myofibril – Nucleus – Sarcolemma (cell membrane of muscle)

31. Myofibril diagram Myofibril Sarcomere Z disc Light band (I band) Dark band(A band) Thick and thin filaments

32. Microfilaments (thick and thin) Sarcomere Z disc Thin fimaments Thick filaments

33. Answers B C A D A D C B C A D B D C B C D A C A B A B C D