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Questions and Answers
What is the approximate resting membrane potential of a neuron?
What is the approximate resting membrane potential of a neuron?
- -80 mV
- -50 mV
- -70 mV (correct)
- -55 mV
What happens if a neuron fails to reach the threshold potential?
What happens if a neuron fails to reach the threshold potential?
- Membrane hyperpolarization occurs
- Nothing happens (correct)
- Depolarization occurs
- Repolarization occurs
Which ion has the greatest permeability in maintaining the resting membrane potential?
Which ion has the greatest permeability in maintaining the resting membrane potential?
- Calcium (Ca2+)
- Potassium (K+) (correct)
- Chloride (Cl-)
- Sodium (Na+)
What effect does tetrodotoxin (puffer fish consumption) have on nerve tissue?
What effect does tetrodotoxin (puffer fish consumption) have on nerve tissue?
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At the peak of the action potential, which ion's permeability is approximately 12 times larger than potassium?
At the peak of the action potential, which ion's permeability is approximately 12 times larger than potassium?
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What determines the movement of charged particles across the membrane?
What determines the movement of charged particles across the membrane?
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Which ion dominates the extracellular fluid?
Which ion dominates the extracellular fluid?
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What is the major anion of the intracellular fluid?
What is the major anion of the intracellular fluid?
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What is the approximate value of the resting membrane potential?
What is the approximate value of the resting membrane potential?
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Which ion has the greatest permeability at the resting state of the plasma membrane?
Which ion has the greatest permeability at the resting state of the plasma membrane?
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