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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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Excessive alcohol use costs the country approximately $235 billion every year.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Bone marrow transplant. A bone marrow transplant is usually extracted from red bone marrow within a Bone marrow transplant. A bone marrow transplant is usually extracted from red bone marrow within a
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Video: Role of the respiratory system - effect of altered ventilation rates

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