The midpoint of your body's weight is in your abdomen
Arrector pili muscle is the one with hair follicles that has a smooth muscle which is in an unconscious control rather than conscious control. This pull up the follicle causing the goose bumps then. Hope this is the right answer and will be of big help then.
Iz a labratory techneque often used to find the 3 levels of major immunoglobulins.
