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//Endocrine System Diseases, Symptoms & Treatment: The Hormone Foundation//
 * "How Does the Endocrine System Help Maintain Homeostasis? - Yahoo! Answers." //Yahoo! Answers - Home//. Web. 16 May 2011.
 * Answers.com - What Is the Major Organs and Their Functions of Endocrine System." //WikiAnswers - The Q&A Wiki//. Web. 16 May 2011.
 * What Is Hormone? Find the Definition for Hormone at WebMD." //Online Medical Dictionary at WebMD: Find Definitions for Medical Terms//. Web. 16 May 2011.
 * Answers.com - How Are Hormones Transported around the Body." //WikiAnswers - The Q&A Wiki//. Web. 16 May 2011.
 * Answers.com - How Do Feedback Loops in the Nervous System Regulate Conditions in the Body." //WikiAnswers - The Q&A Wiki//. Web. 16 May 2011.
 * Cherry, Kendra. "What Is a Neuron?" //Psychology - Complete Guide to Psychology for Students, Educators & Enthusiasts//. Web. 16 May 2011.
 * What Is Dendrite - General Term." //ALS Chat and ALS Help at the ALS/MND Support Group Forum//. Web. 16 May 2011.
 * Axon." //Wikipedia, the Free Encyclopedia//. Web. 16 May 2011.
 * Neurotransmitters." //My Webspace Files//. Web. 16 May 2011.
 * What Is Axon? Find the Definition for Axon at WebMD." //Online Medical Dictionary at WebMD: Find Definitions for Medical Terms//. Web. 16 May 2011.
 * What Is the Cerebrum?" //WiseGEEK: Clear Answers for Common Questions//. Web. 16 May 2011.
 * Cerebellum." //Wikipedia, the Free Encyclopedia//. Web. 16 May 2011.
 * What Is the Somatic Nervous System?" //WiseGEEK: Clear Answers for Common Questions//. Web. 16 May 2011.