Question 19M.3.HL.TZ2.22
| Date | May 2019 | Marks available | [Maximum mark: 4] | Reference code | 19M.3.HL.TZ2.22 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Describe, State | Question number | 22 | Adapted from | N/A |
State one function of the atrioventricular node.
[1]
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 ✔
A large number could state one correct function of the atrioventricular node, mainly that it causes ventricular systole.
Describe how the structure of cardiac muscle cells allows them to carry out their function.
[3]
Not necessary to present answer in a table.
Award [1] for each set of corresponding structure and function.
Many could provide a correct description including many elements, but many discussed the structure of the heart as a whole, rather than the cellular structure of cardiac muscle cells or discussed at length the myogenic nature of cardiac tissue.
