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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Medication errors are three times higher among children and infants than with adults.
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).
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.