| Date | November 2017 | Marks available | 1 | Reference code | 17N.3.SL.TZ0.03 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Identify | Question number | 03 | Adapted from | N/A |
Question
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.]
Identify the vein by labelling it with the letter V.
Distinguish between the vein and the artery with reference to structures visible in the micrograph.
Markscheme
label pointing to the upper of the two blood vessels in the micrograph
Note: check the answer carefully as the scan of the diagram is not always clear for candidates writing in pencil
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]
