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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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).
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.