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Electrical Synapse

Cardiac and Smooth Muscle Location

Where are electrical synapses most likely to be found?

Presynaptic Na+ Floods Through Gap Junction

Which of the following most likely occurs during an electrical synapse?

Na+ Influx Initiates Postsynaptic Action Potential

Bidirectional

Which of the following best describes the direction of travel of action potentials in electrical synapses?

Fast Transmission

Connected cytoplasms in electrical synapses most likely results in which of the following (in comparison to chemical synapses)?

Characteristics

Chemical Synapse

Voltage-Gated Calcium Channels Open

Which of the following best describes the first step in neuronal transmission?

Ca2+ Influx

In neuronal transmission, which event is responsible for vesicle-membrane fusion?

Vesicle-Membrane Fusion

During neuronal transmission, calcium influx into the cell most directly results in what?

Exocytosis of Neurotransmitter

During neuronal transmission, what occurs after vesicles containing neurotransmitters fuse with the membrane?

Neurotransmitter Binds Post-Synaptic Receptors

During neuronal transmission, which of the following occurs immediately after exocytosis of neurotransmitter?

Neurotransmitter Breakdown

After a neurotransmitter binds to a post-synaptic receptor, which of the following may occur next?

Neurotransmitter Reuptake

Neuron Resting Potential

More Na+  Outside

Regarding the neuron resting potential, which of the following characteristics is true about the cell?

Sodium-Potassium Pump

Regarding the neuron resting potential, which of the following characteristics helps maintain the membrane potential?

K+  Leaks Out

More K+  Inside

About -70mV

Regarding the neuron resting potential, which of the following is the most representative membrane voltage?

Voltage-Gated Sodium Channels are Closed

Regarding the neuron resting potential, which of the following characteristics prevents depolarization at rest?

Neuron Action Potential Initiation

Summation of Signals

Which of the following most closely describes what a neuron does with inputs from multiple different cells?

-50 mV Threshold Value Reached

Which of the following threshold values is most likely to trigger an action potential?

Voltage-Gated Sodium Channels Open

Which of the following occurs right after the -50 mV threshold is reached in the neuron?

Local Depolarization

Which of the following is most likely to occur at the site where the voltage-gated sodium channels open?

Na+ Influx

Which of the following most directly causes depolarization in a neuron?

Potassium Channels open

A positive membrane potential is most likely to result in which of the following?

Repolarization

An efflux of potassium is most likely to result in which of the following?

Neuron Action Potential Propagation

Unidirectional Depolarization

Which of the following most correctly describes the nature of depolarization in neurons?

Absolute Refractory Period In Preceding Na+ Channels

Which of the following best describes the time during which the neuron cannot depolarize?

Neighboring Voltage Gate Channels Open

The sodium influx at the initial site of action potential generation most likely leads to which of the following?

Nodes of Ranvier

Action potentials are able to propagate down the neuron due to which of the following?

Myelination Increases Propagation Speed

Insulation of the axon and decreasing the loss of electrical signal most likely results in which of the following?

Saltatory Conduction

Which of the following best describes the jumping of the action potential from one Node of Ranvier to another?

Neuron Action Potentials

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