DP Biology (first assessment 2025)
Question 19M.2.HL.TZ2.22a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.HL.TZ2.22a |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | State | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.2.HL.TZ2.22a
(a)
State one function of the atrioventricular node.
[1]
Markscheme
a. relays signal from SAN to ventricles ✔
b. causes ventricular systole ✔
c. delays signal enabling both ventricles to contract simultaneously
OR
delays signal so the atria empty before ventricular systole ✔
Examiners report
A large number could state one correct function of the atrioventricular node, mainly that it causes ventricular systole.
