Chem 1004t Finals Review Questions (Carleton U), Drugs And The Human Body Final Already Passed

At times, PCP use results CNS depression. At other times , it causes stimulation.How can one drug have such opposite effects ? Is alcohol a similar type of drug ? {Ans: Some drugs differ in their effects depending on the dose. Alcohol in low doses accelerates the heart, but at high doses slows down the heart rate, so it is similar to PCP in the dosage can change the response. Other factors here include individual body chemistry, presence of other medications in the system and the presence or absence of food in the stomach at the time of drug ingestion.}Explain how the Pill works as a contraceptive {Ans: Synthetic progestins (similar to progesterone) circulate to the pituitary gland, where they suppress hormones that cause ovulation. This is the same action that the natural hormone progesterone carries out during pregnancy. Estrogen in the Pill prevents breakthrough bleeding and leads to a more natural monthly menstrual cycle.}benzodiazepines act as CNS depressants due to blocking the action of GABA {Ans: F}The health problem Americans are most likely to treat with a nonprescription (T or F) {Ans: F}A new BC pill has a pregnancy rate of 0.3 per 100 woman