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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).

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Massive amounts of wood are stored on the forest floor of old-growth temperate coniferous forests of Massive amounts of wood are stored on the forest floor of old-growth temperate coniferous forests of
Electron Microscope Images of a Diatom Electron Microscope Images of a Diatom
The digital multimeter should be set to read DC volts and the red lead connected to the battery ... The digital multimeter should be set to read DC volts and the red lead connected to the battery ...
Connecting a handheld digital storage oscilloscope to an oxygen sensor signal wire. The use of the ... Connecting a handheld digital storage oscilloscope to an oxygen sensor signal wire. The use of the ...
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