Question: how many skeletal muscle fibers do we normally use at any one time

title: Skeletal muscle
text: Every single organelle and macromolecule of a muscle fiber is arranged to ensure form meets function . The cell membrane is called the sarcolemma with the cytoplasm known as the sarcoplasm . In the sarcoplasm are the myofibrils . The myofibrils are long protein bundles about 1 micrometer in diameter each containing myofilaments . Pressed against the inside of the sarcolemma are the unusual flattened myonuclei . Between the myofibrils are the mitochondria .