QUESTION 3 An action potential occurs if current injected into a neuronthe neuro

Question

QUESTION 3 An action potential occurs if current injected into a neuronthe neuron to reach potential. a depolarizes; synaptic hyperpolarizes; synaptic depolarizes; threshold hyperpolarizes; threshold hyperpolarizes; resting e. QUESTION 4 What is the mechanism of action of most local anesthetics? O a. Hyperpolarize resting membrane potential of neurons Ob. Block glutamate receptors in excitatory synapses CEnhance the activity of inhibitory synapses by acting on postsynaptic GABA receptors O d Block Na channels involved in the generation of action potentials Bind opiate receptors

Explanation / Answer

Correct Answer - A

The resting membrane potential of a neuron is at about -70 mV, which means that it is -70 mV negatively charged when compared it its outside, this makes it in a polarized state. When the positive current is in injected, it depolarizes the neuron to reach its synaptic potential and action potential happens.

Correct Answer - D

Local anesthetics work by deactivating the sodium channels, which makes the nerve unable to depolarize and cause an action potential. Therefore the nerve loses its sensation for a period of time.

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