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There are 20 feet of blood vessels in each square inch of human skin.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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).
Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.