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Goose bumps are a temporary change in the skin. It is caused when a muscle around a hair follicle contracts. This is often stimulated by coldness or fear.
http://answers.ask.com/Arts/Photography/what_cause...
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The release of adrenaline by the body causes goose bumps. Adrenaline is produced in small bean-shaped glands that sit atop the kidneys. The sympathetic nervous system mobilizes the
http://www.ehow.com/facts_7323931_produces-goose-b...
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People get goose bumps because they are either cold or frightened. Tiny muscles in your arms and legs cause your hairs to stand up and become straight, making the "bumps"
http://answers.ask.com/Society/Family/why_do_we_ge...
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