Which of the following ions is released from the sarcoplasmic reticulum to initiate a muscle contraction?

Which of the following ions is released from the sarcoplasmic reticulum to initiate a muscle contraction?

Which of the following ions is released from the sarcoplasmic reticulum to initiate a muscle contraction?





A) Sodium
B) Potassium
C) Magnesium
D) Calcium




Answer: D