Describe an action potential.

A stimulus excites a neuron by causing the opening of sodium channels.
This causes an influx of sodium which causes the opening of other voltage-gated sodium channels.
This causes the membrane to depolarise to threshold. 
Depolarisation is followed by hyperpolarisation where potassium ions leave the cell. 
This returns the membrane to resting potential. 

MK
Answered by Maciek K. Biology tutor

5294 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Describe the structure of a cell wall of a xylem vessesl?


To what extent do the structures and functions of DNA and RNA differ?


Enzymes are proteins. Antarctic fish may have different structure of enzymes to non-antarctic fish. Explain how their enzyme structure may be different.


Can you explain the oxygen dissociation curve.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences