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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).
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Thyroid conditions may make getting pregnant impossible.
According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.