ATP use is lower in smooth muscle than in skeletal muscle in part because
A) there is no sarcoplasmic reticulum calcium ATPase in smooth muscle.
B) smooth muscle myosin does not require an ATP molecule for each cross-bridge cycle.
C) smooth muscle myosin completes the cross-bridge cycle more slowly than skeletal muscle myosin does.
D) calcium removal from the cytoplasm does not require ATP in smooth muscle.
Correct Answer:
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