What does troponin bind to, and what happens when it binds?
A. Ca2+; tropomyosin shifts
B. T tubules; the sarcomere shortens
C. acetylcholine; the sarcomere shortens
D. ATP; tropomyosin returns to normal position
E. tropomyosin; the sarcomere relaxes
Answer: A
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A. antiparallel B. complementary C. redundant D. water-soluble
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