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thick (myosin) filament
made up of protein myosin, contain ATPase enzymes (split ATP to generate power of muscle contraction)
thin (actin) filaments
made up of protein actin, plus regulatory proteins that play a role in allowing or preventing myosin head-binding to actin
specialized, smooth endoplasmic reticulum; sacs and tubules surround each myofibril
fused (complete) tetanus
when the muscle is stimulated so rapidly that no evidence of relaxation is seen ad the contractions are completely smooth and sustained
the myofilaments are successful in their sliding movements, the muscle shortens, movement occurs
state of continuous partial contractions, result of different motor units being stimulated by the nervous system in a systematic way
specialized synergists; hold a bone still or stabilize the origin of a prime mover so all tension can be used to move the insertion
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