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Physiology
All of the following are true statements about electromechanical coupling, EXCEPT:
In smooth muscle, Ca2+ ions bind to calmodulin
Smooth muscle contraction is initiated by myosin light chain phosphorylation
In cardiac muscle, Ca2+ ions bind to troponin
The major source of Ca2+ ions for contraction of skeletal muscle is influx of Ca2+ ions from the extracellular space following voltage-dependent opening of L-type Ca2+ channels.
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