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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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).
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Cancer cell.
Cell differentiation
A typical eukaryotic cell.
Cancer Cell Formation
For a differential white blood cell count, (A) the slide is examined under oil immersion. (B) Cells ...
The cell membrane is a lipid bilayer with signal proteins and channel proteins embedded in it.