What membrane potential must a graded potential reach in order to cause Voltage-gated $Na^+$ channels to open?
Understand the Problem
The question asks at what membrane potential a graded potential must reach in order to cause voltage gated sodium channels to open. Voltage gated sodium channels open when membrane potential reaches threshold potential.
Answer
A graded potential must reach a specific threshold to open voltage-gated Na+ channels.
A graded potential must reach a specific threshold to cause voltage-gated Na+ channels to open, initiating an action potential. Although the exact value isn't specified, it's understood that sufficient depolarization is needed to reach this threshold.
Answer for screen readers
A graded potential must reach a specific threshold to cause voltage-gated Na+ channels to open, initiating an action potential. Although the exact value isn't specified, it's understood that sufficient depolarization is needed to reach this threshold.
More Information
The opening of voltage-gated Na+ channels is crucial for the initiation of action potentials in neurons and muscle cells.
Tips
A common mistake is assuming there's a single, universal voltage number for the threshold, but it can vary slightly depending on the cell type.
Sources
- Na+K+ Pump, graded and action potentials - biology - Reddit - reddit.com
- Ion Channels and the Electrical Properties of Membranes - NCBI - ncbi.nlm.nih.gov
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