agenda 12/2/13
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Agenda 12/2/13. White board review EVERY student needs a white board. 6. muscles use stored ____ for energy. ADP Ca ⁺⁺ ATP All of the above. 9. The contraction of all skeletal muscle cells is due to the movement of?. Thick filaments Endomysium Mitochondria Thin filaments. - PowerPoint PPT PresentationTRANSCRIPT
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Agenda12/2/13
• White board review• EVERY student needs a white board
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6. muscles use stored ____ for energy
A. ADPB. Ca⁺⁺C. ATPD. All of the above
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9. The contraction of all skeletal muscle cells is due to the movement of?
A. Thick filamentsB. EndomysiumC. MitochondriaD. Thin filaments
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10. This letter represents?Be able to label this diagram, not on answer key
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11. The letters point to?Be able to label this diagram, not on answer key
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12. The plasma membrane of skeletal muscle cells is called ________
A. SarcomereB. SarcolemmaC. T-tubuleD. Neuromuscular junction
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13. Muscle tissue has the ability to shorten when adequately stimulated, a characteristic known as
__________.
A. ContractilityB. excitabilityC. ElasticityD. Extensibility
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14. The heads of the myosin Myofilaments are called __________ when they link the thick and thin
filaments together during skeletal muscle contraction.
A. Cross bridgesB. Creatine phosphateC. A bandD. I band
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15. gap between the motor neuron and the muscle fiber it supplies at the neuromuscular
junction is called the __________.
A. Neuromuscular junctionB. Motor end plateC. Axon terminalD. Synaptic cleft
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18. Voluntary muscle tissue is;
A) smooth muscleB) skeletal muscleC) dense regularD) cardiac muscleE) dense irregular
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19. Endomysium covers:
A) fascicles of muscle cellsB) an entire muscleC) an individual muscle cellD) myofibrilsE) smooth muscle only
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21. Which of the following is NOT a function of the muscular system:
A) production of movementB) maintenance of postureC) stabilization of jointsD) generation of heatE) Hematopoiesis
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22. A Sarcomere is:
A) the nonfunctional unit of skeletal muscleB) the contractile unit between two Z discsC) the area between two intercalated discsD) the wavy lines on the cell, as seen in a
microscopeE) a compartment in a Myofilaments
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23. Which one of the following is composed of myosin protein:
A) thick filamentsB) thin filamentsC) all MyofilamentsD) Z discsE) light bands
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24. An elaborate and specialized network of membranes in skeletal muscle cells that function in
calcium storage is the:
A) sarcolemmaB) mitochondriaC) intermediate filament networkD) myofibrillar networkE) Sarcoplasmic reticulum
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25. During skeletal muscle contraction, myosin heads attach to active sites of:
A) myosin filamentsB) actin filamentsC) Z discsD) thick filamentsE) the H zone
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26. Neurotransmitters are released upon stimulation from a nerve impulse
by the:
A) myofibrilsB) motor unitC) thick filamentsD) axon terminals of the motor neuronE) sarcolemma of the muscle cell
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28. Which of the following can actually shorten during a muscle contraction:
A) myosin filamentsB) A bandsC) actin filamentsD) Sarcomere
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29. Place these structures of the skeletal muscle in order from largest to smallest:
1. fascicle2. Myofilaments3. muscle fiber (cell)4. myofibril5. Sarcomere
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1, 3, 4, 5, 2
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32. Why are calcium ions necessary for skeletal muscle contraction:
A) calcium increases the action potential transmitted along the sarcolemma
B) calcium releases the inhibition on Z discsC) calcium triggers the binding of myosin to actinD) calcium causes ATP binding to actinE) calcium binds to regulatory proteins on the
myosin filaments, changing both their shape and their position on the thick filaments
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33. Acetylcholine is
A) an ion pump on the postsynaptic membraneB) a source of energy for muscle contractionC) a component of thick MyofilamentsD) an oxygen-binding proteinE) a neurotransmitter that stimulates skeletal
muscle
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34. Which of these events must occur first to trigger the skeletal muscle to generate an
action potential and contract:
A) sodium ions rush into the cellB) acetylcholine (ACh) causes temporary permeability
to sodiumC) diffusion of potassium ions out of the cellD) operation of the sodium-potassium pumpE) acetylcholinesterase (AchE) breaks down
acetylcholine (ACh)
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Answers• C• D• B• A• A• D• B• C• E• B• A
• E• B• D• D• 1,3,4,5,2• C• E• B