how come when we are afraid of something (e.g spiders and bugs) does our body make us feel as if their is one crawling

how come when we are afraid of something (e.g spiders and bugs) does our body make us feel as if their is one crawling up our legs and arms?

Posted on June 19, 2015 by in Question. Comments Off on how come when we are afraid of something (e.g spiders and bugs) does our body make us feel as if their is one crawling