The term tetanus describes which condition?

• A. A viral rash.
• B. A neurological disease caused by a toxin.
• C. A skin wound.
• D. A sustained muscular contraction caused by rapid nerve impulses.

Answer: (D)

Tetanus is best understood by focusing on its effect on muscles: a toxin produced by bacteria disrupts nerve signals, so muscles can contract forcefully and stay contracted. That lasting, rigid contraction is the key feature you would describe when talking about the condition, which is why a statement about a sustained muscular contraction captures the essence of tetanus. The toxin doesn’t cause a rash or arise as just a skin wound, and while it involves the nervous system, the most recognizable description for the condition is the prolonged muscle contraction that results from disrupted nerve control.