Definition
Sarcoplasm is the cytoplasm of a muscle cell. It's the fluid-filled space surrounding the myofibrils, which are the contractile units of muscle. Sarcoplasm contains glycogen, myoglobin, and various enzymes necessary for muscle contraction. Think of it as the 'soup' that keeps the muscle cells' machinery running smoothly. It differs from regular cytoplasm due to its specialized function in supporting muscle activity.