What is the role of calcium ions in muscle contraction?
a) They bind to myosin, allowing it to bind to actin.
b) They are released from the sarcoplasmic reticulum to initiate contraction.
c) They break down ATP to provide energy.
d) They are pumped into the muscle fiber to cause relaxation.
Answer: b) They are released from the sarcoplasmic reticulum to initiate contraction.
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