10 Questions
Which force is responsible for the equilibrium membrane potential of a nerve cell?
Electrical force
Why does the resting potential of a nerve exist?
The membrane is impermeable to large negative proteins
What is the Nernst equation used for?
Calculating the equilibrium membrane potential of a nerve cell
What does RT/F equal at room temperature (25°C, 298K)?
25 mV
Given the outside and inside concentrations of K+ ion as 20,400 g/l, what is the equilibrium membrane potential of K+?
20 mV
Which type of stimuli can initiate an action potential in a neuron?
Both physical and chemical stimuli
What is the approximate change in membrane potential required to initiate an action potential?
20 mV
Which ion passes through the membrane, causing depolarization during an action potential?
Na+
What happens to the membrane potential during depolarization?
It becomes more positive
How long does the action potential typically last in most neurons and muscle cells?
A few milliseconds
Test your knowledge on equilibrium potential and resting potential of nerve cells in this quiz. Learn about the Nernst equation and how it calculates the equilibrium membrane potential for different ions.
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