| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ2.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 23 | Adapted from | N/A |
Question
What initiates an action potential along a neuron?
A. Potassium and sodium ions diffuse out of a neuron.
B. Potassium and sodium ions diffuse into a neuron.
C. Neurotransmitters cause depolarization of membrane.
D. Acetylcholinesterase breaks down acetylcholine.
Markscheme
C
Examiners report
N/A
Syllabus sections
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