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um.. not what you think.. the pupil of the eye.

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βˆ™ 14y ago
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βˆ™ 6mo ago

The pupils of the eye dilate up to 10 times their normal size when a person is excited or in low light conditions. This allows more light to enter the eye and improves vision in dimly lit environments.

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βˆ™ 16y ago

pupils

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Q: Part of the human body that can grow 10 times bigger when exited?
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