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Physiology Test Question
Which one of the following is NOT true about smooth muscle?
Both actin and myosin are found in the smooth muscle cell cytoplasm, but these are not arranged in sarcomere units.
The needed calcium (Ca
) for contraction comes primarily from the extracellular fluid.
Similar to skeletal muscle cells, smooth muscle cells are capable of only all-or-nothing twitches.
Smooth muscle cell contractions are weak but sustained.
Unlike the myosin molecules of skeletal muscle cells, the myosin found in smooth muscle cells is quite long, with its entire length covered with myosin head groups.
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Posted: Sunday, January 4, 2015