[问答题]
1.Distinguish between .- qhzmjj n-qvy 68 sjwn+r50ta myofibril, the sar+;wchfm+x.ka9 luul3coplasmic reticulum and the sarcolemma.fa; xl.9 lmu+h3+ckuw
2.Outline the different proteins and their position in the sarcomere when the muscle is relaxed.