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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

The female reproductive system. (a) Sagittal section through the pelvis. (b) Top view of pelvic orga The female reproductive system. (a) Sagittal section through the pelvis. (b) Top view of pelvic orga
skull sagittal and inferior skull sagittal and inferior
The oral cavity: (A) sagittal section; (B) anterior view as seen through the open mouth. The oral cavity: (A) sagittal section; (B) anterior view as seen through the open mouth.
Sagittal section of brain Sagittal section of brain
Medial view of sagittal section Medial view of sagittal section
Sagittal section of eye and its accessory structures Sagittal section of eye and its accessory structures
Video: Chloroplast Structure & Light Dependent Reactions (Photosystem 1 and 2 Cyclic Electron Flow)

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