DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.17b.ii
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.sl.TZ0.17b.ii |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 2]
17N.3.sl.TZ0.17b.ii
Some analgesics are derived from compounds found in plants.
(b.ii)
Explain why opiates are addictive.
[2]
Markscheme
Any two of:
interact with opioid receptors in the brain
alter the structure of brain cells
OR
alter the way the brain works «so that it only works normally when the opiates are present»
OR
prevents transmission of pain impulses inside the brain
release dopamine «that the person craves»
OR
give a feeling of pleasure/euphoria «that the person craves»
withdrawal symptoms «prevent patient from terminating drug use»
Accept specific withdrawal symptoms.
[Max 2 Marks]
