DP Biology (last assessment 2024)
Question 19M.3.HL.TZ1.21b.i
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.HL.TZ1.21b.i |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Identify | Question number | b.i | Adapted from | N/A |
b.i.
[Maximum mark: 1]
19M.3.HL.TZ1.21b.i
The micrograph shows cardiac muscle.
[Source: https://commons.wikimedia.org/wiki/File:Musculocardiaco.jpg by Goyitrina,
licensed Creative Commons Attribution-Share Alike 3.0]
(b.i)
The structure labelled X in the micrograph is a junction between two cardiac muscle cells. Identify the structure labelled X.
[1]
Markscheme
intercalated disc ✔
Examiners report
About half of the students correctly identified intercalated discs from the diagram, with the most common incorrect answer being Z-lines or another part of the sarcomere.
