DP Biology (last assessment 2024)
Question 19M.3.SL.TZ1.16
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.SL.TZ1.16 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Identify, Outline | Question number | 16 | Adapted from | N/A |
16.
[Maximum mark: 2]
19M.3.SL.TZ1.16
(a)
Outline one consequence for the heart of the eating disorder anorexia nervosa.
[1]
Markscheme
breakdown/weakening of heart muscle
OR
electrolyte imbalance affecting the cardiac cycle
OR
low blood pressure/heart rate ✔
Examiners report
Some answers on the effects of anorexia nervosa on the heart were too vague to receive credit.
(b)
The micrograph shows cardiac muscle.
[Source: https://commons.wikimedia.org/wiki/File:Musculocardiaco.jpg by Goyitrina,
licensed Creative Commons Attribution-Share Alike 3.0]
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
Very few candidates recognised an intercalated disc.