Term
| in a resting skeletal muscle, calcium is stored: |
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Definition
| in the sarcoplasmic reticulum |
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Term
| an action potential in vertebrate skeletal muscle fibers increases intracellular calcium levels because: |
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Definition
| travels down the transverse tubules, stimulates voltage-sensitive receptors, and opens calcium channels in the sarcoplasmic recticulum membrane |
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Term
| calcium initiates a contraction of skeletal muscle by binding with: |
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Definition
|
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Term
| during a single-twitch contraction of a skeletal muscle fiber: |
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Definition
| maximum tension is never achieved |
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Term
| during incomplete tetanus, the amount of tension increases above that seen with a single twitch because: |
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Definition
| there is intracellular accumulation of calcium |
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Term
| during single twitch-type contractions, the muscle contracted: |
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Definition
| and returned to resting length before it contracted again |
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Term
| during summation, the muscle contracted: |
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Definition
| but did not return to resting length before it contracted again |
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Term
| during incomplete tetanus, the muscle: |
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Definition
| contracted so that the single contractions created more tension than seen during single twitch |
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Term
| during complete tetanus, the muscle |
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Definition
| produced a prolonged (fused) contraction and single contractions could not be seen |
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Term
| contraction is produced by an increase in the level of calcium in the cytoplasm. where is calcium stored when the muscle is at rest? |
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Definition
| in the sarcoplasmic reticlum |
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Term
| why would the rate of muscle relaxation be slower after tetanus than after a single twitch? |
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Definition
| takes time for the large amount of calcium in the cytoplasm to be taken up by the sarcoplasmic reticulum |
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