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BIO 308: Physiology
Lab 8
11
Physiology
Undergraduate 3
01/31/2016

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