does size of an object increase when contracted and decrease when relaxed?
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A concentric contraction causes muscles to shorten, thereby generating force. Eccentric contractions cause muscles to elongate in response to a greater opposing force. Isometric contractions generate force without changing the length of the muscle.
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As with skeletal muscle, changes in length alter the active force by varying the degree of overlap of the thick myosin and thin actin filaments. ... An increase in the level of circulating epinephrine and norepinephrine from the sympathetic nervous system also increases the force of contraction.
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