Its the skin raising the hair to trap air, Which your body will heat up and in theory warm you up.
Your body is trying to adjust to temperature.
No, it regulates insulin in your body. Your skin, an organ not a muscle, helps control temperature in the body and goose bumps is just one way of warming up.
Goose bumps are the tiny bumps you get all over your body when you get the chills, also sometimes referred to as goose pimples.
You get "goose bumps" and your hair starts to grow if you have shaved legs :)
Goose bumps, also called goose pimples, goose flesh, chill bumps, chicken skin, people bumps, or the medical term cutis anserina, are the bumps on a person's skin at the base of body hairs which involuntarily develop when a person is cold or experiences strong emotions such as fear or awe.
Homeostasis.The body tries to maintain a certain body temperature to continue it's metabolic reactions.Shivering to get warm is an example of homeostasis. This is because shivering causes heat to be generated from the movement and friction. "Goose bumps" and sweat are also examples of homeostasis.
Goose bumps are raised on the human skin under two conditions. The first is in response to cold, when goose bumps rise it helps the body to stay warm due to muscle contraction as well as the erect hairs creating an extra later of insulation. The second is due to emotions, primarily fear, but it is also possible with other emotions.
Stress can likely raise or lower the body temperature, depending on the exact type of stress. If you are angry, you might feel hot and out of breath. If you are frightened, your skin may feel clammy and you may have goose bumps. If you are cold (a type of stress too), the body will release hormones to help your body burn more energy to warm you up.
Increase
Increase the body temperature.
Yes it is. When you sweat, or get goose bumps, your body is making sure you stay comfily at 98.6 degrees ferinheight. If you get too hot you can get overheated, or get hyperthermia, opposite of hypothermia. (hope I spelled those right !])
Yes. Increase in body temperature increase your basal metabolic rate. This hold true for rise in temperature for few degree Celsius only.