Sarcoplasm is the cytoplasm of a muscle cell, specifically in striated muscle fibers, which includes skeletal and cardiac muscle. It contains various organelles, such as mitochondria, myofibrils, and the sarcoplasmic reticulum, as well as proteins, enzymes, and ions essential for muscle contraction and metabolism. Sarcoplasm plays a crucial role in energy production and storage, facilitating the muscle's ability to contract and relax during movement.