-The endocrine system is the information signaling system.
-Their glands produce hormones.
-This system regulates mood, growth and development, tissue function and metabolism.



-The hypothalamus controls body temperature, hunger, thirst, fatigue, anger, and circadian cycles.
-It secretes hormones to tell other glands to create their hormone GHRH

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-The pineal body secretes melatonin
-Melatonin may help regulate sleep patterns.
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