Which of the Following Is the First Step in Excitation-Contraction

question 28

Multiple Choice

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.

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