Have an account?
Skip to Content
Build your own quiz
Suggestions for you
34 questions
Show Answers
See Preview
- 1. Multiple Choice
Calcium binds to ___of the troponin-tropomyosin complex.
troponin
tropomyosin
actin
myosin
- 2. Multiple Choice
___are regulatory proteins that cover the myosin binding site on the actin.
troponin-tropomyosin
sarcomere
sarcolemma
sarcoplasmic reticulum
- 3. Multiple Choice
___are thin filaments.
troponin
tropomyosin
actin
myosin
- 4. Multiple Choice
___are thick filaments.
actin
myosin
troponin
tropomyosin
- 5. Multiple Choice
Calcium is stored in the ___.
sarcoplasm
sarcolemma
sarcoplasmic reticulum
transverse tubules
- 6. Multiple Choice
A ___extends from one Z disc to another Z disc.
Sarcolemma
Neuromuscular junction
Sarcomere
Motor end plate
- 7. Multiple Choice
___gets shorter during contraction.
actin
myosin
troponin-tropomyosin
none of these
- 8. Multiple Choice
___forms a crossbridge with actin.
actin
myosin
calcium
ATP
- 9. Multiple Choice
___provides energy for muscle contraction and relaxation.
cAMP
ADP
ATP
M line
- 10. Multiple Choice
___slides inward during muscle contraction.
actin
myosin
- 11. Multiple Choice
Thick filaments in a myofibril are
ATPase
Sarcoplasmic reticulum
Actin
Myosin
- 12. Multiple Choice
The plasma membrane of a skeletal muscle cell is called the:sarcomeremyofilamentsarcolemmasarcoplasm - 13. Multiple ChoiceThe functional unit of the muscle cell is the:SarcomereOsteonMyofilamentMuscle fiber
- 14. Multiple ChoiceWhat two chemicals are necessary for muscle contraction to occur?Niacin and PotassiumCalcium and ATPSodium and PotassiumAch and Potassium
- 15. Multiple Choice
Calcium:
causes ATP binding to actin
increases the action potential along the sarcolemma
triggers the binding of myosin to actin
- 16. Multiple Choice
What is a crossbridge?
Where myosin binds to actin
Where the calcium crosses into the cytoplasm
Where calcium binds with troponin
- 17. Multiple ChoiceThe energy needed to perform a muscle contraction comes directly fromATPOxygenGlucoseCalcium
- 18. Multiple ChoiceAnaerobic respiration results in "oxygen debt" in the form of ________.ATPlactic acidpyruvic acidcreatine
- 19. Multiple ChoiceCellular respiration that occurs without oxygen present is calledaerobicanaerobicisotonicisometric
- 20. Multiple Choice
The way in which the structures of the sarcomere work together in order to contract is known as the _______________.
The Sliding Filament Model
Action Potential
Sarcolemme
Muscle Fiber
Rigor Mortis
- 21. Multiple Choice
Identify what occurs during the Sliding Filament Model. (check all that apply)
When the nervous system stimulates muscle fibers, the myosin on the thick filaments latch onto actin of thin filaments to begin sliding.
The attachment forms and breaks multiple times during a muscle contraction to generate tension and propel thin filaments toward center of sarcomere.
All sarcomeres in the cell slide simultaneously to make the muscle cell shorten.
The myosin on the thin filaments latch onto actin of thick filaments to begin sliding.
- 22. Multiple Choice
Which change do you observe during a muscular contraction shown in the images?
ATP detaches
the actin dissolves
H zone expanded
Distance between Z discs shortened
- 23. Multiple Choice
An Action Potential in the muscular system is essentially....(select 2)
a sequence of events of chemicals communicating with other chemicals to trigger a muscle contraction.
the biochemical communication between a motor neuron and the muscle it controls.
the denaturation of Acetylcholine to relax a muscle and stop a contraction.
the contraction of muscles shortly after death due to the unavailability of ATP and excess of Calcium.
- 24. Multiple ChoiceThe organelle that contains actin and myosin.TendonmyofilamentmyofibrilFiber
- 25. Multiple ChoiceThe Ions that are responsible for removing Troponin from Tropomyosin.SodiumCalciumPotassiumMagnesium
- 26. Multiple Choice___ and ___ are regulatory proteins bound to actin.Troponin and tropomyosinMyosin and actinCalcium and OxygenGlycogen and hemoglobin
- 27. Multiple ChoiceSkeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.Muscle cellNeuronGlandNone of the above
- 28. Multiple Choice
What state is the sarcomere in the top image?
Relaxed
Contracting
Fully Contracted
None of the above
- 29. Multiple Choice
What state is the sarcomere in the middle image?
Relaxed
Contracting
Fully Contracted
None of the above
- 30. Multiple Choice
The sliding filament theory of muscle contraction says
Actin and myosin filaments condense, thus causing the filament to shorten which in turn shortens the muscle
Myosin rotates and wraps actin around it making the muscle shorter
Friction is reduced between thin and thick filaments causing the thick filaments to move inside the thin
Actin filaments slide over myosin filaments, making the muscle shorter
- 31. Multiple Choice
Which number represents the sarcomere?
1
2
3
4
- 32. Multiple Choice
Which number represents the actin filament?
1
2
3
4
- 33. Multiple Choice
Which number represents the myosin filament?
1
2
3
4
- 34. Multiple Choice
What state is the sarcomere in the bottom image?
Relaxed
Contracting
Fully Contracted
None of the above
- Answer choicesTagsAnswer choicesTags