IB Biology C2.2.3 Nerve impulses as action potentials
IB Biology C2.2.3 Nerve impulses as action potentials
Practise tracing action potentials along neurons, from threshold and depolarisation to propagation across the axon membrane.
How this is tested
- explain how reaching threshold opens sodium channels and starts depolarisation
- link local currents to depolarisation of the next section of axon membrane
- interpret stimulus graphs to decide whether an action potential is triggered