What is a spasm in the context of muscular injuries?

A spasm, in the context of muscular injuries, refers to an involuntary muscle contraction that occurs suddenly and without control. This contraction can be similar to a cramp, where the muscle tightens and can cause pain or discomfort. Spasms may arise due to various factors, including dehydration, overuse of a muscle, or a muscle strain.

In contrast, a long-lasting muscle extension would describe a different concept, typically related to stretching rather than a spasm. Voluntary muscle movement involves conscious control over muscle contractions, which is distinctly different from the involuntary nature of a spasm. A technique to prevent injury usually pertains to specific methods or practices aimed at avoiding strain or injury, rather than describing a physiological event like a muscle spasm. Thus, the correct characterization of a spasm is its involuntary nature and similarity to cramping, making option B the most accurate result.