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Did you know?
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.
Did you know?
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.