| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 23 | Adapted from | N/A |
Question
Immediately after an action potential, which event causes the neuron membrane to repolarize?
A. Voltage-gated sodium channels open.
B. Voltage-gated potassium channels open.
C. Voltage-gated calcium channels close.
D. Voltage-gated potassium channels close.
Markscheme
B
Examiners report
N/A
Syllabus sections
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