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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).
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.