Two systems

Your body has two systems that help you maintain homeostasis: the nervous system and the endocrine system. The nervous system is a complex network of nervous tissue that sends electrical and chemical signals. The nervous system includes the central nervous system (CNS) and the peripheral nervous system (PNS) together. The central nervous system is made up of the brain and spinal cord, and the peripheral nervous system is made up (mainly) of the nerves that lies outside the CNS.
The endocrine system is a system of glands around the body that release chemical signal molecules into the bloodstream. The electrical signals of the nervous system move very rapidly along nervous tissue, while the chemical signals of the endocrine system act slowly in comparison and over a longer period of time. Working together, the nervous and endocrine systems allow your body to respond to short or long term changes in your environment.Your nervous system mostly through your eyes and ears constantly monitors your surroundings, alerting you instantly at any sign of change or danger.

	Nervous System	Endocrine System
* Means of transmision	nerve impulses by nerves	hormones in blood
* Speed of response	rapid	slow
* Duration of response	brief	long
* Regulation and coordination functions	rapid responses such as locomotion	maintained responses such as growth and metabolism

If you do any difficult activity, your nervous system mostly through your eyes and ears constantly monitors your surroundings, alerting you instantly at any sign of change or danger. Your endocrine system gears up your muscles and cardiovascular system for the response.