The use of crack alters the processes of the brain by causing a change in the way neurons in the brain communicate. Nerve cells, called neurons, communicate with each other by supplying the brain with chemicals called neurotransmitters. These neurotransmitters allow information in the form of electrical impulses to be passed through the body. This process works by neurotransmitters attaching themselves to certain areas in the brain.

Water makes up about 80% of the brain and is an essential element in neurological transmissions. Poor hydration adversely affects a child's mental performance and learning ability. Symptoms of mild dehydration may include tiredness, headaches and a feeling not unlike jet lag, as well as reduced alertness and ability to concentrate. Mental performance including memory, attention and concentration can decrease by about 10 per cent, once thirst is felt. See similar questions...

Through the use of sophisticated technology, scientists can actually see the dynamic changes that occur in the brain as an individual takes cocaine. They can observe the different brain changes that occur as a person experiences the "rush," the "high," and finally the craving of cocaine. They can also identify parts of the brain that become active when a cocaine addict sees or hears environmental stimuli that trigger the craving for cocaine. See similar questions...

Concrete, like all other materials, will slightly change in volume when it dries out. In typical concrete this change amounts to about 500 millionths. Translated into dimensions-this is about 1/16 of an inch in 10 feet (.4 cm in 3 meters). The reason that contractors put joints in concrete pavements and floors is to allow the concrete to crack in a neat, straight line at the joint when the volume of the concrete changes due to shrinkage. See similar questions...

With "functional Magnetic Resonance Imaging" (fMRI), it is shown that, when dyslexics are taught to read fluently using synthetic phonics, they develop the use of the same pathways in the brain as normal fluent readers. See similar questions...

People with serious forms of anxiety demonstrate chronic over-activity in the areas of the brain associated with fear or nervousness. An inhibitory neurotransmitter, gamma aminobutyricacid (GABA) works in these areas to diminish this excessive nerve cell activity. There is evidence that benzodiazepines cause an increase in the activity of GABA, thereby returning the system to a normal level and reducing the associated symptoms of anxiety. See similar questions...

Crack works on the automatic nervous system. The automatic nervous system controls the sympathetic system which speeds everything up such as heart rate and breathing. The autonomic nervous system also controls the para-sympathetic system which does the exact opposite (slows things down). This explains why people become hyper when the smoke crack. See similar questions...

The model will not replace experiments, but it will allow experiments to be much more focused and better optimized. In a sense the model can be used to design the ideal experiment and then test the experiment before moving to a final version animal experiments. So it will definitely save the slow road of trial and error and exploration in animal experiments. See similar questions...

In Washington, initiatives take effect 30 days after they are voted on unless otherwise specified by the initiative. This means I-692 went into effect on December 3, 1998. See similar questions...

Some women have reported that their RP has progressed more rapidly during pregnancy than it ever had previously. However, because RP is rare, this issue is difficult to study in a systematic way. If you are pregnant, or thinking of becoming pregnant, you should make sure that your obstetrician/gynecologist is aware of your eye problems, and that your eye care professional knows of your pregnancy. See similar questions...

Your free trial registration will take place immediately. Should you decide to become a full-fledged subscriber to the iPOLL system, you will need to contact iPOLL Customer Services at 860-486-4440 to upgrade your subscription status. See similar questions...

Very gradually, the inside of the tipi, above the fire, will get dark as the fabric absorbs the pigments from the smoke. However, the tannic acid and oils in the smoke has a tendency to "tan" and "season" the cover and make it more waterproof and more resistant to deterioration. The Indians would usually build a fire with green wood in a new "skin" tipi to saturate the tipi surface with smoke. See similar questions...

I see some patients wearing rings around their legs. Does it hurt and how long do they have to be kept. See similar questions...

If you mail or fax your application to us, your coverage will be effective on the day after postmark if mailed, or the day after you fax it to us. See similar questions...

The degree of cracking (or "checking" as it is called by carvers) that occurs in a carving really depends on several things. First it depends on the amount of moisture in the log. If the log is freshly cut, it retains a great deal of the original moisture of the tree. It may take years for the wood to dry out. Most logs dry at about 1 inch per year. So a fresh cut log that is 18 inches in diameter may take up to 8 or 9 years to completely dry. See similar questions...

Almost every untrained singer experiences "voice breaks". Some singers deal with the break by forcing the chest voice up, other singers are taught to sing in only the head voice, staying away from chest voice altogether, and others simply lower the keys of songs to avoid high notes. None of these solutions are correct, and all can result in limited choices in song material and an ultimately deteriorating instrument. See similar questions...