Which of the following is the first step in excitation-contraction coupling
A) Exposed actin sites bind with myosin cross bridges.
B) Troponin binds calcium.
C) Calcium is released from the sarcoplasmic reticulum.
D) Sodium channels open in the fibre's membrane.
Correct Answer:
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Q38: During contraction, asynchronous cycling of cross bridges
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Q43: Binding of which substance to myosin permits
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