Z discs - a dark line separating adjacent I-bands in muscle cells., Sarcomeres - the basic contractile unit of muscle fiber., Myosin - a protein of muscle that with actin is active in muscular contraction., Actin - a protein that forms the contractile filaments of muscle cells, and is also involved in motion in other types of cells., Calcium - A mineral needed for healthy teeth, bones, and other body tissues., Dark Band - contains the whole thick filament (myosin) as well as the end of actin filaments., Light Band - contains only the thin filament (actin)., Cross bridges - the attachment of myosin with actin within the muscle cell., Myosin heads - the part of the thick myofilament made up of myosin that acts in muscle contraction, by sliding over thin myofilaments of actin.,

Muscular System Definitions

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