Animal responses can be controlled by the nervous system and?

Animal responses can be controlled by the nervous system and endocrine system. The nervous system is a complex network of nerves and nerve cells that carries messages to and from the brain and spinal cord to all parts of the body. The endocrine system is a network of glands that produce and release hormones into the bloodstream. Hormones are chemical messengers that travel throughout the body and control a wide range of functions, including growth, reproduction, and metabolism.