| In certain skeletal muscle fibers, namely the red or slow contracting muscle fibers, the nuclei may be found scattered throughout the sarcoplasm. |
| The muscle tissue is composed of muscle fibres with plenty of water and inorganic salts in the sarcoplasm. |
| The removal of calcium ions from the sarcoplasm by the sarcoplasmic reticulum is energy-requiring. |
| The other 50 percent consists of the proteins in the Z line and M band, the enzymes in the sarcoplasm and mitochondria, collagen, and the proteins in membrane structures. |
| Within the sarcolemma is the sarcoplasm, containing all the usual subcellular elements plus long prominent myofibrils. |
| The sarcoplasmic reticulum controls the level of calcium ions in the sarcoplasm. |
