| Date | November 2009 | Marks available | 1 | Reference code | 09N.1.SL.TZ0.28 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 28 | Adapted from | N/A |
Question
The graph below shows changes in membrane potential in an axon during the passage of an action potential. What is causing the decrease in membrane potential at point X?
A. Sodium ions entering the axon
B. Potassium ions entering the axon
C. Sodium ions leaving the axon
D. Potassium ions leaving the axon
Markscheme
D
Examiners report
This turned out to be a very difficult question, where many candidates believed C was correct instead of D.
Syllabus sections
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