We have two communication systems.
1.) Nervous system - fast responses
2.) Hormones - slower responses
Both of these systems help to keep a constant internal environment - this is called Homeostatis.
The Nervous system uses electrical impulses to transmit messages and respond to them quickly. In vertebrates, the nervous system is made of nerve cells (neurons). It is controlled by the central nervous system (the brain and spinal cord).
Hormones are chemicals that travel in the blood. They carry information over the body and bring about long-lasting responses. Hormones transmit messsages more slowly than nerves.
An example of Homeostatis is if you are too hot, the brain detects that the temperature of the blood flowing through is too high. It sends an electrical impulse through the nervous system to your sweat glands. You start to sweat more.
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