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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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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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Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Unique markings identify individual humpback whales. Unique markings identify individual humpback whales.
The nictitating membrane The nictitating membrane
Pituitary hormones and their target cells, tissues, and/or organs. Pituitary hormones and their target cells, tissues, and/or organs.
The ossicles of the middle ear along with the oval window and tympanic membrane. The ossicles of the middle ear along with the oval window and tympanic membrane.
Achondroplasia. The individual in this photograph has the reduced limb development that typifies thi Achondroplasia. The individual in this photograph has the reduced limb development that typifies thi
(a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko (a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko
Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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