Which of the following statements regarding contraction in skeletal and smooth muscle is true?
A) In skeletal muscle, calcium ion mediates changes in thin filaments that lead to cross-bridge activity; in smooth muscle, calcium ion mediates changes in thick filaments that lead to cross-bridge activity
B) In skeletal muscle, calcium ion binds to a regulatory protein on thin filaments; in smooth muscle, calcium ion binds to a regulatory protein on thick filaments
C) In skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin
D) Both in skeletal muscle, calcium ion mediates changes in thin filaments that lead to cross-bridge activity; in smooth muscle, calcium ion mediates changes in thick filaments that lead to cross-bridge activity and in skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin are true
E) All of the choices are true
Correct Answer:
Verified
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