Page 77 - 84 human physiolofy part-1

The Nervous System

Methamphetamine

In the US, medically prescribed
methamphetamine is distributed in tablet
form under the brand name Desoxyn®.

Illicit methamphetamine comes in a
variety of forms. Most commonly it is
found as a colorless crystalline solid, sold
on the street under a variety of names, such
as: crystal meth or crystal. Crystal
methamphetamine may also be referred to Illegal methlab.
as shards, rock, P, upside-down b, pony,
crissie, crystal, glass, ice, devil's dandruff, chimichanga, Jib, critter, Tina, Crawford, Working Man's
Cocaine, Pook, tik, or "broken glass". People may confuse crack cocaine with methamphetamine.

It is also sold as a less-pure crystalline powder called crank or speed, or in crystalline rock form
called dope, shit, tina, or tweak; both "dope" and "speed" are often used to refer to other drugs.
Colorful flavored pills containing methamphetamine and caffeine are known as yaba (Thai for "crazy
medicine"). At its most impure, it is sold as a crumbly brown or off-white rock commonly referred to
as peanut butter crank. See the list of street names for a more comprehensive list of common street
names for methamphetamine.

Methamphetamine found on the street may be pure, or adulterated with chemicals that were used
to synthesize it. In some instances, it may be diluted or cut with non-psychoactive substances like
inositol. In other instances, it may be mixed with other psychoactive drugs.

Marijuana

The drug cannabis is produced from parts of the cannabis plant, primarily the cured flowers and
gathered trichomes of the female plant. The major active chemical compound tetrahydrocannabinol,
commonly referred to as THC, has psychoactive and medicinal effects when consumed, usually by
smoking or ingestion. Cannabis has been consumed by humans for thousands of years; in the 20th
century there was an upswing in the use of cannabis for recreational and religious purposes.

The possession, use, or sale of psychoactive cannabis products became illegal in many parts of the
world in the early 20th century. Since then, while some countries have intensified the enforcement of
cannabis prohibition, others have reduced the priority of enforcement to the point of de facto legality.
Cannabis remains illegal in the vast majority of the world's countries.

The nature and intensity of the immediate effects of cannabis consumption vary according to the
dose, the species or hybridization of the source plant, the method of consumption, the user's mental and
physical characteristics (such as possible tolerance), and the environment of consumption. This is
sometimes referred to as set and setting. Smoking the same cannabis either in a different frame of mind
(set) or in a different location (setting) can alter the effects or perception of the effects by the
individual. Effects of cannabis consumption may be loosely classified as cognitive and physical.
Anecdotal evidence suggests that the Cannabis sativa species tends to produce more of the cognitive or
perceptual effects, while Cannabis indica tends to produce more of the physical effects.

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