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The average adult has about 21 square feet of skin.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
On average, the stomach produces 2 L of hydrochloric acid per day.
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).