DP Biology (first assessment 2025)
Question 19M.2.HL.TZ2.d
| Date | May 2019 | Marks available | [Maximum mark: 3] | Reference code | 19M.2.HL.TZ2.d |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Sketch | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 3]
19M.2.HL.TZ2.d
Sketch the pattern seen in a typical electrocardiogram (ECG) trace for one complete cardiac cycle, including labels of the main features.
[3]
Markscheme
a. sketch with the correct shape ✔
b. P, Q, R, S and T indicated ✔
c. atrial contraction/systole/depolarisation labelled ✔
d. ventricular contraction/systole/depolarisation labelled ✔
e. ventricular relaxation/diastole/repolarization labelled ✔
Correct shape should show peaks at P R and T and dips at Q and S
Examiners report
In part (d) the better candidates could sketch the pattern seen in a typical electrocardiogram. Some made errors in the shape or letters but could still achieve marks for showing the areas of contraction or relaxation.
