Start at resting potential, trace depolarisation and repolarisation with channel direction and use graph coordinates or concentration data in the requested comparison.
Many predatory animals produce toxins to disable their prey. Some of these toxins inhibit nervous communication.
Describe the role of ion transport in maintaining the resting potential of a neurone.
The pufferfish produces a neurotoxin called tetrodotoxin (TTX).
The graph shows the effect of TTX on the nerve impulse in an axon.
Membrane voltage / mV
Deduce how TTX inhibits nerve impulses in an axon.
