When an action potential is triggered, what happens to the cell membrane?
Understand the Problem
The question is asking about the physiological changes that occur in a cell membrane when an action potential is triggered, specifically looking for the sequence of depolarisation and repolarisation.
Answer
Depolarization triggers sodium channels to open, letting sodium ions enter, causing a net positive charge inside the neuron.
Once an action potential is triggered, the neuron depolarizes as sodium channels open, allowing sodium ions to enter the cell, resulting in a net positive charge inside the neuron compared to the outside.
Answer for screen readers
Once an action potential is triggered, the neuron depolarizes as sodium channels open, allowing sodium ions to enter the cell, resulting in a net positive charge inside the neuron compared to the outside.
More Information
An action potential is a critical process in nerve signal transmission. It involves a sudden change in the electrical charge of a neuron's membrane, propagating the nerve signal.
Tips
A common mistake is confusing depolarization with repolarization. Be clear that depolarization involves sodium ions entering the neuron.
Sources
- The web page with info on - Example Source - en.wikipedia.org
- Neuron action potentials: The creation of a brain signal - khanacademy.org
- Ion Channels and the Electrical Properties of Membranes - NCBI - ncbi.nlm.nih.gov
