contraction

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contraction (in animal physiology) The shortening of muscle fibres in order to exert a force on a tissue or organ of the body. In striated muscle contraction is brought about by interaction of actin and myosin filaments (see sarcomere; sliding filament theory; voluntary muscle): it provides a force for locomotion and plays a role in maintaining the balance and posture of the animal. See also involuntary muscle.

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