DP Biology (first assessment 2025)

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Question 19M.2.HL.TZ2.18d

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Date May 2019 Marks available [Maximum mark: 3] Reference code 19M.2.HL.TZ2.18d
Level HL Paper 2 Time zone TZ2
Command term Sketch Question number d Adapted from N/A
d.
[Maximum mark: 3]
19M.2.HL.TZ2.18d
(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.

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