DP Biology (last assessment 2024)
Question 17N.3.SL.TZ0.b
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.SL.TZ0.b |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Distinguish | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
17N.3.SL.TZ0.b
The micrograph shows a transverse section through blood vessels of a mammal.
[Source: This book was originally published by OpenStax College, released under the CC-By license: https://creativecommons.org The eBook was adapted by Frank Lee.]
Distinguish between the vein and the artery with reference to structures visible in the micrograph.
[2]
Markscheme
a. vein has larger lumen
b. vein has less elastic tissue
c. vein has less muscular/thinner walls/tunica media
OR
ratio of wall thickness to lumen is less in the vein
d. vein less rounded/squashed more easily
Accept inverse for artery
Do not accept non-visible differences such as valves
No ECF
[Max 2 Marks]
