How does an action potential work?

Resting potential at - 75mV

Stimulus causes opening of sodium channels and influx of sodium ions, membrane becomes less polarized

Threshold potential reached at -55mV, opening of many more sodium channels, greater influx of sodium ions --> action potential generated

CH

Related Biology A Level answers

All answers ▸

give two features of DNA that is important for DNA replication


The herbicide atrazine works by disabling plastoquinone, one of the proton pumps in photosystem II. Explain how atrazine would kill a susceptible plant (5 marks) (OCR A specimen paper 3)


In photosynthesis, what are the products of the Light Dependent reaction, and the Light Independent reaction (Calvin Cycle)?


How is mitosis different from meiosis?