Muscle contraction?

I am wondering if calcium ions are stored in the transerse tubule during muscle contraction? Thank You.

If not where are they stored? The sacroplasmic reticulum?
Answer:
Calcium ions are indeed stored in the sarcoplasmic reticulum in muscle cells. Good job.

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wuh?

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what are you talking about? what is the sacroplasmic reticulum?? I think you should ask your doctor. Sorry..

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I think people who havent taken anatomy/physiology should stop answering anatomy/physiology ?s ....anyway the person of above me is right after the calcium has bound with the troponin the excess is pumped back into the sarcoplasmic reticulum via Ca atpase pumps.

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At the opening of each transverse tubule onto the muscle fiber surface, the action potential spreads inside the muscle fiber.
At each point where a transverse tubule touches part of the sarcoplasmic reticulum, it causes the sarcoplasmic reticulum to release Ca++ ions.
The calcium ions result in movement of troponin and tropomyosin on their thin filaments, and this enables the myosin molecule heads to "grab and swivel" their way along the thin filament. This is the driving force of muscle contraction.
The answer is sarcoplasmic reticulum.

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