Which of the following statements regarding smooth muscle versus striated muscle is false?
A. Calcium for skeletal muscle contraction
enters the cell from the sarcoplasmic
reticulum and through voltage-gated calcium
channels in the plasma membrane, whereas
the calcium for smooth muscle contraction
enters the cell from the sarcoplasmic
reticulum only.
B. Smooth muscle contraction is regulated by
the binding of calcium to calmodulin, whereas
skeletal muscle contraction is regulated by
the troponin-tropomyosin system.
C. Smooth muscle is activated by the
autonomic nervous system, whereas skeletal
muscle is activated by the somatic nervous
system.
D. Separate enzymes mediate the binding of
myosin to actin through phosphorylation and
dephosphorylation in smooth muscle,
whereas the myosin heads of skeletal muscle
function as enzymes themselves to hydrolyze
ATP.
E. Smooth muscle contracts longer and
relaxes more slowly compared to skeletal
muscle.
A
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