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ADA NBDE National Board Dental Part I

Category - NBDE

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Which of the following is not true of smooth muscle cells?

they have only one nucleus
they are typically very long
their myofibrils are not striated
they have an extensive SR

Explanation

Answer: D - Smooth muscle cells have a poorly developed sarcoplasmic reticulum. Relaxation occurs when Ca2+ is taken up by the SR. With a less extensive SR, smooth muscle can maintain contraction for longer periods of time.

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ADA NBDE National Board Dental Part I

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ADA NBDE National Board Dental Part I

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