This digital document is an article from UXL Complete Health Resource, brought to you by Gale®, a part of Cengage Learning, a world leader in e-research and educational publishing for libraries, schools and businesses. The length of the article is 1440 words. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser. This award-winning resource covers the causes symptoms, diagnoses, tests, treatments and prognoses of 140 health problems; the main systems of the human body, including the circulatory system, the endocrine system, special senses and much more; and a detailed examination of nutrition, and medical and mental health issues.