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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Mutations caused by air pollution. Mutations caused by air pollution.
Continued harvest of (a) cod and (b) mountain sheep by humans has caused evolutionary changes in mat Continued harvest of (a) cod and (b) mountain sheep by humans has caused evolutionary changes in mat
Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t
Abnormalities Caused by Cardiac Pathology Abnormalities Caused by Cardiac Pathology
Goiter is an enlarged thyroid gland caused by an iodine deficiency Goiter is an enlarged thyroid gland caused by an iodine deficiency
Opener Pigment mutations within an ear of corn, caused by transposition of the Ds element Opener Pigment mutations within an ear of corn, caused by transposition of the Ds element
Video: Lactation and Breast Feeding

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