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7 questions
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- Q1A typical neuron has a resting membrane potential of about−70 V−70 mV+70 V+70 mV30sHS-LS1-2
- Q2Which of the following ions are involved in neuronal action potentials?Na+Cl−Na+ and K+ onlyK+30sHS-LS1-2
- Q3In the nervous system, the strength of the stimulus is coded into:the amplitude of action potentials generatedboth the frequency and amplitude of action potentials generatedthe frequency of action potentials generated30sHS-LS1-2
- Q4At what membrane voltage do neuronal voltage-gated Na+ channels become activated?−55 mV−70 mV+50 mV0 mV30s
- Q5The spike phase of the action potential is due to:the closure of resting K+ channelsthe opening of voltage-gated Cl− channelsthe opening of voltage-gated K+ channelsthe opening of voltage-gated Na+ channels30s
- Q6Na+ and K+ permeation through their respective ion channels represents an example of:Primary active transportSecondary active transportPassive transport30s
- Q7Which of the following is NOT true about the neuronal action potential?Repolarization and hyperpolarization are due to the activity of K+ channels.Action potentials are all-or-nothing.All of the above are true about action potentialsAction potentials travel along axons in a non-decremental fashion.30s