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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
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.
Excessive alcohol use costs the country approximately $235 billion every year.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%