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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

When the United States gets stuck over a controversial issue—usually something a divided Congress ca When the United States gets stuck over a controversial issue—usually something a divided Congress ca
People whose behaviors violate norms are often called mentally ill. “Why else would they do such ... People whose behaviors violate norms are often called mentally ill. “Why else would they do such ...
A steady but low reading could indicate retarded valve or ignition timing. A steady but low reading could indicate retarded valve or ignition timing.
Video: Pores and Ion Channels

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