I need to know the steps of a muscle contraction for these terms , basically I just need to know what order to put these in and I know a few. Here are the terms: troponin, tropomyosin, neuromuscular junction, acetylcholine, acetylcholinesterase, sodium, potassium, calcium, calmodulin, calsequestron, sarcoplasmic reticulum, sarcolemma, t-tubules, actin, myosin, myosin cross-bridge, ATP, sarcomere. I know that the sarcoplasmic reticulum is first, then the t-tubules, then i think the calcium but I can not find the other steps.