DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ1.23a
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.hl.TZ1.23a |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
19M.3.hl.TZ1.23a
Opium and its derivatives have been used for thousands of years as strong analgesics.
(a)
Explain how opiates act to provide pain relief.
[2]
Markscheme
«temporarily» bond/bind to «opioid» receptors in the brain/CNS [✔]
block the transmission of pain impulses [✔]
Examiners report
The question asked candidates to explain how opiates provide pain relief. This was difficult and was poorly answered by many. As this has been asked many times over the years, it would be an advantage to candidates to practise answering past examination questions.
