PNS backlash symptoms (parasympathetic nervous system) include which of the following?

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When the body shifts from high alert to parasympathetic dominance, the heart rate slows and blood vessels dilate. This can lower blood pressure and reduce blood flow to the brain, leading to dizziness or lightheadedness. Dizziness is a classic sign of parasympathetic backlash because it reflects this temporary drop in cerebral perfusion as the body rebalances after stress. The other options aren’t typical parasympathetic rebound symptoms: excessive bleeding points to blood loss, shock is a broader perfusion crisis, and exhaustion is a general fatigue state rather than a direct parasympathetic rebound sign.