Why do we get goosebumps when it's cold ?

When you suddenly enter a cold place or hit a cold wind, will your arms get lumpy?

That's goosebumps.

Originally, goosebumps is a mechanism that warms the body so that heat does not escape from the body when it is cold.

The muscles at the base of the hair are tightened, and the hair stands out.

Unfortunately, humans have less hair, so even if we get goose bumps, heat can escape frome the body.

Not only when it's cold, but also when you feel anxiety or danger, you get goose bumps in an attempt to protect your body.

The face has weak muscles and thin hair, so it is difficult to get goose bumps.