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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).
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
The average adult has about 21 square feet of skin.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.