How is thermoregulation achieved

When it is too cold the hypothalamus in the brain detects it is too cold it sends nerve impulses or electrical signals through the nervous system to targeted areas:erector muscles (don't laugh): are constricted and so pull hair on your skin up, this traps air; air is an insulator which will help keep the body warm.skeletal muscles: will be start vibrating in quick constrictions and relaxation this is known as shivering, this rapid movement will produce heat and help keep the body warm.Blood vessels: the vessels will constrict and so keeping most of the blood flow to the major organs which require blood the most as well as the heat it provides. This also prevents any heat from the blood from radiating out through the skin as less blood reaches the extremities of the body.This is an example of negative feedback where the body's response to a stimulus reduces the stimulus' effect.Thermoregulation is important as it keeps the body at 37 degrees celsius which is the optimum tempertaure for the body as it ensures all the body's enzymes are working closest to their optimum.