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Hair follicles. Tiny muscles around them tighten, causing bumps. But the real reason you get goose bumps is that they make your hair stand up straight. This is important, not to humans, anymore, but to animals for two reasons:

1. The standing-up hair is more effective as an insulator, and helps keep the animal warm. This is why goose bumps occur when it is cold.

2. To an enemy, the standing-up hair makes the animal look bigger, and may cause another animal to not attack.

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12y ago
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12y ago

Erector pilli

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11y ago

erector pilli

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Q: The structure that contracts to cause goose bumps is the?
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