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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Foliage height diversity and bird species diversity (data from MacArthur and MacArthur 1961).