Multiple Choice
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
Correct Answer:
Verified
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