Multiple Choice
Which of these statements describes contraction in skeletal and smooth muscle
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, troponin and tropomyosin are regulatory proteins; in smooth muscle, troponin is the only regulatory protein on thick filaments.
C) In skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin.
D) In skeletal muscle, calcium ion binds to calmodulin; in smooth muscle, calcium ion binds to troponin.
Correct Answer:
Verified
Correct Answer:
Verified
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