Myosin - A thick, contractile protein filament, with protusions known as Myosin heads
Powerstroke - the action of the myosin head in musclar contraction. The head group attaches to the actin filament and tilts backwards, pulling the think filament to overlap with the thin filament
Calcium - These ions attach o the troponin causing it to change shape
Actin - A thin, contractile protein filament, containing 'active' or 'binding' sites
Tropomyosin - A actin-binding protein which regulates muscle contraction
Cross-bridge - In volutary muscles, the joining of a myosin head group to an actin thin filament in the prescence of calcium ions
Sarcoplasmic Reticulum - A specialised endoplasmic reticulum
Myofibril - a cylinderical organelle running the length of the muscle fibre, containing Actin and Myosin filaments
Sacromere - smallest contractile unit in voluntary muscle, consisting of thin & think filaments
Troponin - A complex of three proteins, attached to Tropomyosin
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