Which of the Following Is the First Step in the Sliding

question 186

Multiple Choice

Which of the following is the first step in the sliding mechanism of muscle contraction

• A)The myosin heads of the thick filaments bind to active sites on the thin filaments.
• B)Myosin heads pivot toward the M line when cross-bridge binding occurs.
• C)Thin filaments are pulled toward the center of the sarcomere.
• D)The cross-bridges detach and return to their original positions.
• E)A carbohydrate molecule is broken down to produce energy.

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