marijuna
Marijuana, the crude drug made from the leaves and flowering tops of the cannabis sativa plant, contains hundreds of active chemicals. Of the 421 chemicals identified in the plant, 70 are cannabinoids (chemicals found only in the marijuana plant and nowhere else in nature). Cannabinoids are stored in the fat parts of cell membranes for long periods of time and interfere with normal cell functioning. Since the 70 annabinoids are fat-soluble, they build up or accumulate in body tissue. Three to seven days after using marijuana, a 50 percent level of biochemical activity will remain in the cells. It takes the body 20 to 30 days to metabolize or wash out the chemicals from the marijuana. Some clinicians feel that it may take as much as six to 12 weeks of no marijuana use for the long-term heavy user to become free from the drug. In one respect, marijuana is similar to DDT and other pesticides, which are also fat-soluble and build up in human tissue. The marijuana plant is a complex and unpredictable chemical factory. The amount of THC (the major mind-altering chemical in marijuana) produced in the plant leaves and flowering tops will vary from plant to plant, even within the same plant, and from hour to hour. The marijuana us
cells. These places are called receptors, because they receive information from other nerve cells and from chemicals. When a receptor receives information, it causes changes in the nerve cell. The chemical in marijuana that has a big impact on the brain is called THC -- tetrahydrocannabinol. Scientists recently discovered that some areas of the brain have a lot of THC receptors, while others have very few or none. These clues are helping researchers figure out exactly how THC works in the brain. Some of THC's effects are useful in the world How do the chemicals in marijuana change the way a person sees,hears, smells, tastes, and feels things? When someone uses marijuana, these chemicals travel through the bloodstream and quickly attach to special places on the brain's nerve
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Approximate Word count = 2697
Approximate Pages = 11 (250 words per page double spaced)
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