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

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

• A. Movement
• B. Digestion
• C. Posture
• D. support

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

• A. Thick filament
• B. Myosin
• C. Thin filament
• D. Muscle cell

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

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

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

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

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

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

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

• Muscle fiber
• Endomysium
• Fascicle
• Perimysium
• epimysium

• Has nucleus so it
MUST be the muscle cell
– Myofibril
– Nucleus
– Sarcolemma (cell membrane of muscle)

• Myofibril
• Sarcomere
• Z disc
• Light band (I band)
• Dark band(A band)
• Thick and thin filaments

• Sarcomere
• Z disc
• Thin fimaments
• Thick filaments

• B
• C
• A
• A
• D
• A
• D
• C
• B
• C
• A
• D
• B
• D
• C
• B
• C
• D
• A
• A
• C
• A
• B
• A
• A
• B
• C
• D