Name: 為什麼我們會起雞皮疙瘩？| #aumsum (Why do we get Goosebumps? | #aumsum)
Uploaded: 2025-12-08T10:51:30.000Z
Duration: 1 min 44 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Goosebumps served a purpose for our ancestors who had a lot of hair on their body.

When our ancestors felt cold, their adrenal glands produced adrenaline.

Adrenaline caused the arrector pili muscles which are attached to the hair follicles to contract.

Creating shallow depressions on the skin surface and making the hair stand straight up.

The straightened hair trapped more air which prevented their body heat from escaping.

Also, when our ancestors felt afraid of any animal.

The adrenaline made their hair stand up making them look bigger and thus, scared their attacker.

Now, as this characteristic of goosebumps is inherited by us.

We also get them during strong emotions or when it is cold.

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