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20 Cards in this Set
- Front
- Back
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if a tissue has branched cells,striations, and one nucleus per cell, then that tissue could be |
cardiac muscle |
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if a tissue has not striations, then that tissue is |
smooth muscle |
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what produces the striations of a skeletal muscle |
the arrangement of myofilaments |
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the ability of a muscle tissue cell to generate an action potential when stimulated is referred to as |
excitability |
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the dense layer of collagen fibers that surround an entire skeletal muscle is the |
epimysium |
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the cell membrane of skeletal muscle is called the |
sarcoplasmic reticulum |
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The SR stores |
calcium ions |
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the substance that temporarily stores oxygen in a skeletal muscle cell is called |
myoglobin |
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the thick myofilament of a myofibril are believed to contain |
both actin and myosin |
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the thin myofilaments of a myofibril are believed to contain |
protein tropomyosin, actin, and troponin |
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opening of sodium channels in the membrane of a muscle fiber of neuron results in |
deploarization |
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the resting membrane potential is caused because which if the following ions leak out of the cell? |
potassium |
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the resting membrane potential for a typical neuron of skeletal muscle cell is |
-70mv |
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which of the following occurs when a graded potential reaches the threshold level? |
voltage-gated sodium channels open |
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during the stage of repolarization of the cell membrane |
potassium ions rapidly move to the outside of the cell. |
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during the stages of depolarization of the cell membrane |
sodium ions rapidly move to the inside of the cell |
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in the sliding filament model the function of tropomyosin is to |
block the binding sites on actin when the cell is at rest |
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in the sliding filament model the function of calcium is to |
join with troponin to uncover the active sites of the actin |
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in response to depolarization the SR of a muscle fiber |
releases calcium ions |
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in the sliding filament model the myosin joins with which molecule to cause a contraction |
actin |
