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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).
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
The longest a person has survived after a heart transplant is 24 years.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.