Substance use Essay Example | Topics and Well Written Essays - 250 words - 1

Substance use - Essay Example On the other hand the parasympathetic nervous system slows the heart rate, causes papillary constriction, and increases digestion. 2. List and explain three mechanisms by which drug tolerance might occur.  (One paragraph-at least 4 sentences) Drug tolerance occurs through different ways in the body. Three major mechanisms of drug tolerance go down to the molecular level. It can occur when the degradation enzymes for a specific drug are increased in the body and this result in the destruction of the drug before it begins its action. In another mechanism the receptors for the drug are removed temporarily or the down regulation of receptors occurs. These receptors are necessary for the action of the drug and decreased receptors might result in drug tolerance. Enhanced excretion of the drug is the third mechanism through which tolerance to the drug occurs. Excretion of the drug increases when the tolerance to it increases. 3. Discuss why current laws on crack possession have been criti cized. Include at least three of these criticisms.  (One paragraph-at least 4 sentences) Current laws on crack possession have been criticized by many because the same laws for crack in the powder form are lenient. Critics put forward that crack in powder form should also be penalized in the same way as normal crack is.