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The Endocrine System
Electroencephalography or EEG is a way of determining the electrical activity of the brain. It is used sometimes to evaluate individuals with sleep disorders and is used to detect the presence of seizure disorders.
THE ENDOCRINE SYSTEM
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The endocrine system can be important in the study of psychology. The basic messengers of the endocrine system are hormones, which are similar to neurotransmitters except that they act at a distance. There are hormone receptors just as is seen with neurotransmitters but pass through the bloodstream in order to reach the target organ. In addition, the activity is not as fast as is seen with neurotransmitters and there is often a negative feedback system that turn off production of the hormone when the concentration is considered high enough. Figure 11 illustrates the major organs of the endocrine system:
