If you've ever broken a bone, there's a good chance you needed surgery, braces, or splints to realign the bone. Severe fractures in infants, on the other hand, can heal on their own through a process ...
Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.
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