Injury- pain, swelling, discoloration, ecchymosis ...

Muscle contraction in response to pain. Clonic - Involuntary muscle contraction characterized by alternate contraction and relaxation in rapid succession. Tonic - Type of muscle contraction characterized by constant contraction that lasts for a period of time. Muscle soreness - Pain caused by overexertion in exercise. Tendinitis - Inflammation ... ................
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