The nurse is teaching a class on muscular coordination and explains it is the movement of what electrolyte that contributes to the process of muscle contraction and relaxation?
A) Calcium
B) Chloride
C) Magnesium
D) Hydrogen
A
Feedback:
Calcium is released from the sarcoplasmic reticulum, which leads to the binding of calcium with troponin–tropomyosin. This leads to contraction of the muscle fiber. The calcium pump then moves calcium back into the sarcoplasmic reticulum, which leads to relaxation of muscle fiber. Chloride, magnesium, and hydrogen are not involved in this process.
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