In this video, we look at the action potential and the all-or-nothing principle. First we explore the events that take place during the action potential. We explore how voltage-gated ion channels operate and how the axon membrane undergoes depolarisation, repolarisation and hyperpolarisation. We then explore what is meant by the all-or-nothing principle.

Resting potential:    • A Level Biology Revision (Year 13) "T...  

Receptors:    • A Level Biology Revision (Year 13) "T...