Multiple Choice
What is the role of Ca2+ in the control of muscle contraction?
A) It causes depolarization of the T tubule system.
B) It changes the conformation of troponin, which ultimately results in myosin-binding sites being exposed.
C) It changes the conformation of myosin heads, causing actin and myosin filaments to slide past each other.
D) It binds to tropomyosin and breaks actin-myosin cross-bridges.
E) It blocks the ATP-binding site on myosin heads, enabling muscles to relax.
Correct Answer:
Verified
Correct Answer:
Verified
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