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antagonistic muscles:
pairs of muscles that move parts of the body in opposite directions

posture:
the way you hold your body when you stand or sit

varicose veins:
veins in the body, usually the legs, which have been stretched out of shape and do not move blood through the body effectively anymore

Answer :

Mark2Bud
Antagonist and agonist muscles often occur in pairs, called antagonistic pairs. As one muscle contracts, the other relaxes. An example of an antagonistic pair is the biceps and triceps; to contract - the triceps relaxes while the biceps contracts to lift the arm

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