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Date November 2013 Marks available 1 Reference code 13N.1.SL.TZ0.27
Level Standard level Paper Paper 1 Time zone TZ0
Command term Question number 27 Adapted from N/A

Question

The diagram below shows the changes in membrane potential during an action potential.

What best describes events indicated by the label X?

 

Markscheme

D

Examiners report

This question was a good discriminator. Many of those getting this incorrect chose C, showing confusion as to which ion was diffusing into the neuron.

Syllabus sections

Core » Topic 6: Human physiology » 6.5 Neurons and synapses
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