These brain utilizes two separated systems to control these processes, the nervous system and the endocrine system. The nervous system is the fastest out of the two. Two send a message fast, the brain uses the nervous system. The endocrine system sends most messages slowly. It uses hormones to produce more long lasting effects.
Hormonal messages travel through the blood stream.
It may take several hours or days to reach the destination or to effect a change. Endocrine system is a collection of ductless glands throughout the body that secrete hormones directly into the blood stream. These glands include the pituitary, thyroid, thymus, adrenals, pancreas, ovaries or testes, and many others. The function of these glands are to control the internal environment of the entire body. The difference between nervous system and endocrine system can be illustrated as follows.