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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each 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.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
The human body produces and destroys 15 million blood cells every second.