Nerve pathways from the spinal cord throughout the body are regulated by the ANS. It is divided into: SNS – Sympathetic Nervous System, activated in adults by stress (e.g., fight-or-flight). The PSNS – Parasympathetic Nervous System involves the relaxation response. (Guiffre, Kenneth, MD, with Theresa Foy DiGeronimo. The Care and Feeding of Your Brain. p 25-26. NJ: Career Press, 1999.)

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