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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th
Fire Pink Fire Pink
Fire ant ball Fire ant ball
This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p
It is important for new employees to know the location of all fire extinguishers. (B) Aim low toward ... It is important for new employees to know the location of all fire extinguishers. (B) Aim low toward ...
A spark tester connected to a spark plug wire or coil output. A typical spark tester will fire only ... A spark tester connected to a spark plug wire or coil output. A typical spark tester will fire only ...
Video: Chemical Messengers Animation

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