十万个为什么·科学启蒙30篇（4）
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Why We Close Our Eyes When We Sneeze
为什么打喷嚏会闭眼
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Sneezing is a powerful reflex triggered by irritation in the nasal passages or throat.
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Nerves in the nose send signals to the brainstem, which coordinates multiple muscle groups simultaneously.
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One automatic response is tightening the eyelid muscles, causing eyes to shut tightly without conscious control.
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This protective action helps prevent irritants, mucus, or tiny particles from entering the eyes during the explosive exhale.
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The force of a sneeze can exceed 100 miles per hour, making eye protection especially important.
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Even people who try to keep their eyes open usually cannot override this hardwired reflex.
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Scientists believe blinking during a sneeze may also stabilize head position for better respiratory efficiency.
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The entire sequence—from trigger to eye closure—takes less than half a second.
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It is not caused by air pressure pushing the eyes shut, as some myths claim.
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This reflex highlights how closely linked our sensory and motor systems are for survival.