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- 1. Multiple Choice
Muscles are attached to bones by _____.
Ligaments
Tendons
Cartilage
Axons
- 2. Multiple Choice
Contractile unit of a muscle.
sarcomere
motor unit
fascicle
myofibril
- 3. Multiple Choice
Thick filaments are in a myofibril are
ATPase
Sarcoplasmic reticulum
Actin
Myosin
- 4. Multiple Choice
Thin filaments in a myofibril are
Sarcomeres
Sarcoplasm
Actin
Myosin
- 5. Multiple Choice
Calcium:
causes ATP binding to actin
increases the action potential along the sarcolemma
binds to proteins on myosin
triggers the binding of myosin to actin
- 6. Multiple Choice
What is a crossbridge?
Where myosin binds to actin
Where the calcium crosses into the cytoplasm
Where calcium binds with troponin
None of the answers are correct.
- 7. Multiple Choice
The energy needed to perform a muscle contraction comes directly from
ATP
Oxygen
Glucose
Calcium
- 8. Multiple Choice
Calcium binds to ___of the troponin-tropomyosin complex.
troponin
tropomyosin
actin
myosin
- 9. Multiple Choice
The neurotransmitter stored in the axon terminal identified as #3
Calcium Ion (Ca2+)
Protein Channel
Acetylcholine
Synaptic Cleft
- 10. Multiple Choice
What is the structure that stores the Calcium in the muscle cell.
Sarcoplasm
Sarcolemma
Myoglobin
Sarcoplasmic Reticulum
- 11. Multiple Choice
Which is voluntary?
cardiac
skeletal
smooth
- 12. Multiple Choice
Place the following events in sequence:
A) Your arm moves
B) An impulse travels along a nerve
C) You decide you want to move your arm.
A B C
C B A
C A B
A C B
- 13. Multiple Choice
Which filament slides inward during muscle contraction
Actin
Myosin
- 14. Multiple Choice
What layer of connective tissue covers the muscle fiber?
endomysium
epimysium
perimysium
- 15. Multiple Choice
What layer of tissue surrounds the entire muscle?
Endomysium
Epimysium
Perimysium
- 16. Multiple Choice
Which of the following best describes the power stoke?
actin's troponin pulls on the myosin filament
myosin heads pull on binding sites of the actin filament
- 17. Multiple Choice
Which one shows the correct order of muscle organization?
muscle, muscle fiber, myofibril, fascicle
fascicle, muscle fiber, muscle, myofibril
muscle, fascicle, muscle fiber, myofibril
myofibril, muscle, muscle fiber, fascicle
- 18. Multiple Choice
Which level of muscle organization would represent the cell?
muscle
fascicle
muscle fiber
myofibril
- 19. Multiple Choice
A ___extends from one Z disc to another Z disc.
Sarcolemma
Neuromuscular junction
Sarcomere
Motor end plate
- 20. Multiple Choice
___gets shorter during contraction.
actin
myosin
troponin-tropomyosin
none of these
- 21. Multiple Choice
___slides inward during muscle contraction.
actin
myosin
- 22. Multiple ChoiceRegion where a motor neuron comes in close contact with a muscle cell.neurotransmittermuscular dystrophymuscle tensionneuromuscular junction
- 23. Multiple ChoiceThe gap between a neuron and a muscle cell: (#4 in the diagram)synaptic cleftsarcolemmavesicleCa2+ ion
- 24. Multiple ChoiceThe organelle that stores ACh in the axon is identified as #4Motor NeuronAxon Terminal of Motor NeuronSarcolemmaVesicle
- 25. Multiple ChoiceWhat state is the sarcomere in #1RelaxedContractingFully ContractedNone of the above
- 26. Multiple ChoiceWhat state is the sarcomere in #2RelaxedContractingFully ContractedNone of the above
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