They protect the brain and spinal cord. The skin is called the integumentary system because it is comprised of a number of organs. The skeletal and muscular systems support the body and allow movement. The nervous system and endocrine system regulate and coordinate the activities of the various body systems. Homeostasis refers to the maintenance of constant internal body conditions.
Most body systems contribute to homeostasis of the body.
The endocrine system helps maintain homeostasis through hormone production. The nervous system exerts control over the body, including the endocrine system, by nervous impulse. Many homeostatic mechanisms in the body operate by negative feedback. The hypothalamus regulates body temperature. When body temperature drops below normal, impulses are sent to restrict the flow of blood to the extremities.