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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
On average, the stomach produces 2 L of hydrochloric acid per day.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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.