MICROANATOMY

Detailed explanation-1: -Goosebumps occur when tiny muscles in our skin’s hair follicles, called arrector pili muscles, pull hair upright. For animals with thick fur, this response helps keep them warm. But it doesn’t do so for people.

Detailed explanation-2: -Goosebumps occur when the arrector pili muscles cause the hairs to stand up, making the skin look bumpy. When the hairs stand up on the skin, it is known as piloerection. The arrector pili are smooth, involuntary muscles that a person cannot voluntarily contract.