Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 53

nervous system - Coelenterata, Flatworms and roundworms, Arthropoda, Vertebrates

release transmitter body usually

That part of the body concerned with controlling and integrating the activity of its various parts, providing a mechanism whereby the animal can respond to a changing external environment while still maintaining a constant internal environment. It is composed of nerves (neurones) and supporting cells. The transfer of information between nerve cells (at synapses) is usually by the release of small quantities of transmitter substances. Communication with other body tissues may be by the direct release of transmitter substances on to the tissue (usually in the presence of some other substance, such as an enzyme) or by the release of hormones into the blood stream (either directly from the nervous system or from endocrine glands under its control).

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