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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).
Blood is approximately twice as thick as water because of the cells and other components found in it.
Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
There are 20 feet of blood vessels in each square inch of human skin.