The muscle action potential penetrates into a fiber along the __________.
sarcoplasmic reticulum
Z discs
transverse tubules
neuromuscular junction
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Which component of a thin filament binds to calcium once the calcium ion is released from the sarcoplasmic reticulum?
troponin
actin
myosin
tropomyosin
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The action potential on the muscle cell leads to contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cell?
T tubule
sarcolemma
cytosol
terminal cisternae of the sarcoplasmic reticulum
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How is acetylcholine (ACh) removed from the synaptic cleft?
acetylcholinesterase (AChE; an enzyme)
diffusion away from the synaptic cleft
a reuptake pump on the axon terminal
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