fbpx

πŸ“ˆ Action potential

What happens in a resting state where no impulses are being sent through a neuron?

This is the resting potential where the membrane permeability differentiates between sodium (Na+) and potassium (K+) ions so that at any given time there are more Na+ ions outside than inside and more K+ ions inside than outside.

 

 

According to these electrochemical gradients, Na+ ions should move back inside to balance out their concentration (equilibrate) while K+ ions should move back outside the membrane until the concentrations are equal inside and out. This clearly isn’t the case, so what gives?

 

Found on the membrane there are Na+/K+ pumps which carry out active transport against the electrochemical gradient of these ions. The resting potential of the membrane is negative on the inside and positive on the outside – but how? Aren’t both sodium and potassium ions positively charged? This is achieved by the pump transferring 3 Na+ ions out while taking only…

πŸ† Read 500+ topics for all 6 UK exam boards πŸ†

πŸ“ Enter now to claim your FREE 3-day trial and find answers to all your revision topicsΒ πŸ“

βœ”οΈ Just Β£3.49/month after that. Cancel anytimeΒ βœ”οΈ

You explain everything so simply!Β πŸ™‚Β -SecretDuck on The Student Room