| Date | May 2018 | Marks available | 1 | Reference code | 18M.1.HL.TZ2.36 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 36 | Adapted from | N/A |
Question
Neurons transmit electrical impulses. Which statement describes part of this process?
A. K+ ions are pumped out of the cell to depolarize the membrane.
B. Ion channels let K+ diffuse into the cell to depolarize the membrane.
C. Na+ ions are pumped into the cell to repolarize the membrane.
D. Ion channels let Na+ diffuse into the cell to depolarize the membrane.
Markscheme
D
Examiners report
[N/A]
