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- 1. Multiple ChoiceWhich ion below IS NOT critical to muscle contraction?Sodium IonCalcium IonPotassium IonPhosphorus Ion
- 2. Multiple ChoiceWhich of the Proteins listed below IS NOT a myofibril protein?
A. Actin
B. Troponin
C. Trypsin
D. Tropomyosin
E. Myosin
F. TitinAll of these listed are myofibril proteinsTroponin is not a myofibril protein.Trypsin is not a myofibril protein.Titin is not a myofibril protein. - 3. Multiple ChoiceA mitochondria's role in muscle contraction is the production of...Synthesis of ATPMetabolism of ATPSynthesis of ProteinsMetabolism of Worn out Proteins
- 4. Multiple ChoiceThe _____ of a cell would be responsible for synthesis of the myofibril proteins.Mitochondria and LeukoplastsRibosomes and Golgi ApparatusRough and Smooth ERsNucleus and Mitochondria
- 5. Multiple ChoiceWhich protein is responsible for helping the muscle 'relax' back to its neutral position?ActinMyosinTitinTropomyosin
- 6. Multiple ChoiceWhich is more true to cause muscle contraction?Actin Pulls on the myosinMyosin Pulls on the TitinMyosin Pulls on ActinActin Pulls on Titin
- 7. Multiple ChoiceWhich ion, when present, changes the conformation of tropomyosin?CalciumSodiumPotassiumLithium
- 8. Multiple ChoiceWhich TWO IONS are pumped in/out of the sarcolemma as part of muscle contraction?Sodium / CalciumCalcium / PotassiumSodium / Potassium
- 9. Multiple ChoiceIn order for tropomyosin to change conformation, calcium has to bind with...Voltage Gated Ion ChannelLigand Gated Ion ChannelTroponin ProteinActin Protein
- 10. Multiple ChoiceWhat opens the ligand gated sodium/potassium channel?Calcium Ion Binding to the channel protein.Acetylcholine binding to the channel protein.Electrical Signal opening the channel protein.Acetylcholinesterase binding to the channel protein.
- 11. Multiple ChoiceWhat opens the Calcium Ion Transport Channel embedded in the pre-synaptic terminal?Binding of AcetylcholineBinding of Calcium IonAn Action PotentialBinding of Sodium Ion
- 12. Multiple ChoiceCalcium that will eventually enter the muscle cell to bind with troponin is stored in the...T-Tubule of the Muscle CellSarcoplasmic Reticulum of the Muscle CellThe Sarcolemma of the Muscle CellThe interstitial space outside the muscle cell near the pre-synaptic terminal.
- 13. Multiple ChoiceWhich of the following occurs first in muscle contraction?Calcium Ion Enters the Pre-synaptic TerminalAcetylcholine Enters the Synaptic CleftSodium Ion Enters the SarcolemmaCalcium Ion Enters the Sarcoplasm (Cytoplasm).
- 14. Multiple ChoiceWhich of the following occurs first in muscle contraction?Myosin /Actin Cross bridge shifts to move actin.Phosphate is released form the myosin globular headCalcium Enters the Sarcoplasm (Cytoplasm) of the muscle cell.ADP is released form the myosin globular head.
- 15. Multiple ChoiceWhich of the following occurs first in muscle contraction?Myosin globular head 'uncoils' releasing stored energy.Cross Bridges are formed between actin and myosinTropomyosin changes shape (conformation) to expose myosin binding sites.Calcium Binds with Troponin
- 16. Multiple ChoiceA build up of charge in the sarcolemma reaches _____ to begin the propagation of an action potential down the length of the sarcolemma.CapacityThresholdIonizationCritical
- 17. Multiple Choice
During muscle contraction the 'Z' Lines will...DisappearGet Farther apartGet Closer TogetherAppear Thicker - 18. Multiple ChoiceDuring full muscle contraction the H Zone will...DisappearGet wider
- 19. Multiple ChoiceDuring full muscle contraction the A Band will...DisappearGet widerStay the sameGet narrower
- 20. Multiple ChoiceDuring an electrocution which probably occurs?All 638 skeletal muscle might relax simultaneously.All 638 muscle cells may contract simultaneously.
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