| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.HL.TZ1.22 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Identify | Question number | 22 | Adapted from | N/A |
Question
What is a characteristic of axons in motor neurons?
A. When there is a resting potential, the outside of the axon is negative relative to the inside.
B. During an action potential, Na+ ions diffuse out of the axon.
C. K+ ions diffusing out of the axon repolarizes it.
D. Impulses in the axon travel towards the cell body.
Markscheme
C
Examiners report
Question 22 was answered relatively unsuccessfully, indicating gaps in candidates' knowledge of the structure and function of motor neurones.
