What Is the Correct Sequence for the Following Events of Muscle

question 23

Multiple Choice

What is the correct sequence for the following events of muscle contraction?
1) Calcium ions are released from the sarcoplasmic reticulum.
2) Power stroke pulls actin toward center of A band.
3) Impulse travels into the T-tubules.
4) Energized myosin heads attach to actin.
5) Calcium reacts with troponin and exposes binding sites on actin.

• A) 1, 3, 5, 2, 4
• B) 3, 1, 5, 4, 2
• C) 1, 5, 4, 2, 3
• D) 3, 5, 4, 2, 1
• E) 2, 4, 5, 3, 1

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