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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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Illicit drug use costs the United States approximately $181 billion every year.

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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Southern Royal Albatross, Diomedea epomophora, is a large seabird from the albatross family. Southern Royal Albatross, Diomedea epomophora, is a large seabird from the albatross family.
Metabolic Disorder notes Metabolic Disorder notes
Crohn's Disease Crohn's Disease
The I-9 form. The I-9 form.
The locations of disease-causing mutations in the cystic fibrosis gene The locations of disease-causing mutations in the cystic fibrosis gene
Video: Muscle Twitch and Muscle Tension - Motor unit size and force

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