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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
Blood is approximately twice as thick as water because of the cells and other components found in it.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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).