Why does our body hair stand up when we feel cold?
Many of us may have noticed that our body hair suddenly stands up in the cold weather of winter.
But what is the secret behind this phenomenon and why does it happen?
When a person experiences low temperatures or experiences strong emotions, he is exposed to goosebumps and the reflection of the effect of these goosebumps appears clearly on the body in what is known as hair standing up.
Goosebumps occur when the small muscles at the base of each hair follicle contract, scientifically known as arrectores pilorum
which in turn contract and pull the hair to appear erect.
Goosebumps are considered involuntary movements controlled by the sympathetic nervous system responsible for many contradictory reactions.
All mammals share this feature, which works to create an insulating layer of air using hair.
This process may have helped keep our human ancestors warm
But today's human body hair is so small that it cannot work to maintain this warmth.