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The horizontal fraction bar was introduced by the Arabs.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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.
Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.