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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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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

The nitrogen cycle. The five main parts of the nitrogen cycle are: The nitrogen cycle. The five main parts of the nitrogen cycle are:
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
This image shows the spread of droplets from an uncovered sneeze. This image shows the spread of droplets from an uncovered sneeze.
Routes for utilizing substrates other than glucose in glycolysis Routes for utilizing substrates other than glucose in glycolysis
Transmission genetics began with the study of pea plants. Transmission genetics began with the study of pea plants.
Video: ADH and the arterioles, kidneys, sweat glands and the Atrial natriuretic peptide (ANP)

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