When Ca2+ is released in the cytoplasm of the muscle cell the muscle contracts (Option B).
What is the sarcoplasmic reticulum?
The sarcoplasmic reticulum (SR) can be defined as a cellular structure that stores calcium ions before muscle contraction.
This cell structure (sarcoplasmic reticulum) is fundamental for regulating the excitation-contraction-coupling during muscle contraction.
In conclusion, when Ca2+ is released in the cytoplasm of the muscle cell the muscle contracts (Option B).
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