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Local Anesthesia Chapter 3 Questions and Answers Latest Version Graded A+
What is the basic functional unit of the nervous system involved in local anesthesia?✔✔ The neuron
What part of the neuron receives incoming signals?✔✔ Dendrites
What part of the neuron transmits impulses away from the cell body?✔✔ Axon
Where are sodium channels located on a neuron?✔✔ On the nerve membrane
What ion primarily enters the neuron during depolarization?✔✔ Sodium
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What ion primarily exits the neuron during repolarization?✔✔ Potassium
What is the term for the difference in electrical charge across a resting nerve membrane?✔✔ Resting membrane potential
What is the typical value of a neuron’s resting membrane potential?✔✔ -70 millivolts
What happens to the neuron’s charge when it is depolarized?✔✔ It becomes more positive
What triggers the opening of sodium channels in a neuron?✔✔ A stimulus reaching threshold
What is the threshold level needed to initiate a nerve impulse?✔✔ Approximately -55 millivolts
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