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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.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The horizontal fraction bar was introduced by the Arabs.
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The human body produces and destroys 15 million blood cells every second.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.