The rate of contraction of smooth muscle is very slow compared to the rate of contraction of cardiac or skeletal muscle. What cellular characteristic of smooth muscle cells could account for this difference in rates?

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    Smooth muscle lacks a sarcoplasmic reticulum in each cell; the calcium must come into the cell from the surrounding interstitial fluids. This takes time.
    Contraction of smooth muscle is involuntary.
    Smooth muscle may be stimulated by hormones.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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Smooth muscle lacks a sarcoplasmic reticulum in each cell; the calcium must come into the cell from the surrounding interstitial fluids. This takes time.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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