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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
Nursing School Humor
Children in Baltimore (1909) pull the stringy parts from beans in preparation for canning. Photograp
Nonverbal communications convey strong, powerful messages that may be negative or positive.
B. F. Skinner documented how operant conditioning changes behavior.
In this 1921 photo of a one-room schoolhouse in Marey, West Virginia, you can see how public ...