WHY the hair on our body straight up when the body Comes Under cold environment
Answers
Goosebumps, piloerection, cutis anserina or horripilation occurs when tiny muscles called the arrector pili muscles at the base of each hair contract and pull the hair erect.
This phenomenon is thought of as an evolutionary remnant where hair standing on end was supposed to gather more heat to the body, thus keeping it warm during extremely cold environments.
Hope this helped...
The reason for all these responses is the subconscious release of a stress hormone called adrenaline. Adrenaline, which in humans is produced in two small beanlike glands that sit atop the kidneys, not only causes the contraction of skin muscles but also influences many other body reactions. In animals, this hormone is released when the animal is cold or facing a stressful situation, preparing the animal for flight-or-fight reaction. In humans, adrenaline is often released when we feel cold or afraid, but also if we are under stress and feel strong emotions, such as anger or excitement. Other signs of adrenaline release include tears, sweaty palms, trembling hands, an increase in blood pressure, a racing heart or the feeling of 'butterflies' in the stomach.