Podcast
Questions and Answers
Which of the following terms describes a decrease in the membrane potential of a neuron?
Which of the following terms describes a decrease in the membrane potential of a neuron?
- Depolarization
- Membrane potential
- Leak channels
- Hyperpolarization (correct)
What are the two major factors that underlie the resting membrane potential of a mammalian neuron?
What are the two major factors that underlie the resting membrane potential of a mammalian neuron?
- Hyperpolarization and membrane potential
- Leak channels and depolarization
- Active properties of membranes and ion gradients
- Concentrations of sodium and potassium (correct)
Which equation is used to calculate the reversal potential of an ion?
Which equation is used to calculate the reversal potential of an ion?
- Nernst equation (correct)
- Ion gradients equation
- Goldman equation
- Membrane potential equation
Which of the following terms is NOT associated with action potentials?
Which of the following terms is NOT associated with action potentials?
Which of the following is responsible for maintaining extracellular potassium levels in brain neurons?
Which of the following is responsible for maintaining extracellular potassium levels in brain neurons?
What can lead to hyper-excitability in neurons?
What can lead to hyper-excitability in neurons?
Which type of electrical response in neurons simply follows the direction of the injected current and decays back to baseline once the stimulus is stopped?
Which type of electrical response in neurons simply follows the direction of the injected current and decays back to baseline once the stimulus is stopped?
What is the term for a rapid and reversible active depolarization of the nerve cell membrane?
What is the term for a rapid and reversible active depolarization of the nerve cell membrane?
What is the coding mechanism used in neurons to transmit information, where frequency of action potential firing is used instead of amplitude?
What is the coding mechanism used in neurons to transmit information, where frequency of action potential firing is used instead of amplitude?
In the figure below, what does the bottom panel plot?
In the figure below, what does the bottom panel plot?
Which ion has a higher concentration inside mammalian neurons compared to outside?
Which ion has a higher concentration inside mammalian neurons compared to outside?
What is the resting membrane potential in neurons?
What is the resting membrane potential in neurons?
What is the main factor that generates electrical potentials across neuronal membranes?
What is the main factor that generates electrical potentials across neuronal membranes?
What is the main reason why passive conduction of electrical signals is not useful for conveying information over long distances?
What is the main reason why passive conduction of electrical signals is not useful for conveying information over long distances?
Which equation can be used to calculate the equilibrium potential for an ion?
Which equation can be used to calculate the equilibrium potential for an ion?
What is the equilibrium potential for potassium (EK+) given a 10-fold difference in concentration between inside and outside the cell?
What is the equilibrium potential for potassium (EK+) given a 10-fold difference in concentration between inside and outside the cell?
If the concentration of potassium inside the cell is increased to 100 mM, what is the resulting EK+?
If the concentration of potassium inside the cell is increased to 100 mM, what is the resulting EK+?
What is the estimated permeability ratio of K+, Na+, and Cl- for a typical neuron at rest?
What is the estimated permeability ratio of K+, Na+, and Cl- for a typical neuron at rest?
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