In an interneuron in the brain, which of the following would be most likely to cause the cell to reach its threshold for firing an action potential?Group of answer choicesa mechanical stimulus activating mechanico-sensitive ion channelsexcitatory post-synaptic inputsinhibitory post-synaptic potentials arriving on the dendritesextracellular currents generated by other neuronsa large magnetic force
Question
In an interneuron in the brain, which of the following would be most likely to cause the cell to reach its threshold for firing an action potential?Group of answer choicesa mechanical stimulus activating mechanico-sensitive ion channelsexcitatory post-synaptic inputsinhibitory post-synaptic potentials arriving on the dendritesextracellular currents generated by other neuronsa large magnetic force
Solution
The most likely cause for an interneuron in the brain to reach its threshold for firing an action potential would be excitatory post-synaptic inputs.
Here's why:
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A mechanical stimulus activating mechanico-sensitive ion channels: This is more likely to occur in sensory neurons that respond to physical stimuli, not interneurons in the brain.
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Excitatory post-synaptic inputs: These inputs can cause depolarization, which if strong enough, can bring the neuron to its threshold and trigger an action potential. This is the primary way neurons in the brain communicate.
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Inhibitory post-synaptic potentials arriving on the dendrites: These actually make the neuron less likely to fire an action potential, as they cause hyperpolarization, moving the neuron further from its threshold.
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Extracellular currents generated by other neurons: While these can influence a neuron's membrane potential, they are not the primary means of causing an action potential.
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A large magnetic force: This is not a typical physiological stimulus for neurons and is unlikely to cause an action potential in an interneuron in the brain.
Similar Questions
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Complete the sentences describing the events that occur during an action potential.An action potential will not occur unless the membrane potential at the (the initial segment of the axon) reaches a level called .When threshold is reached, of the initial segment open briefly, allowing to diffuse into the cell.As these ions enter the cell, the cell membrane undergoes , with the membrane potential increasing to a peak of approximately +30mV.As the peak of the action potential is reached, the sodium channels close and the open, allowing these ions to diffuse out of the cell.As cations leave the cell, the membrane potential at that part of the membrane once again becomes negative. This phase of the action potential is called , because the resting membrane potential is being reestablished.The membrane potential actually dips lower than -70mV because the potassium channels do not close quickly enough. This phase is called .
Interneurons :- :- a- provide communication between the central ends of afferent neuronsb- provide communication between dendrites of the efferent neuronsc- influence the rate of discharge from the alpha motor neuronsd- participate in ascending sensory pathways
Excitatory neurotransmitters are most likely to:
Action potentials (AP) are triggered when the summation of all inputs onto a neuron bring the membrane potential above the AP threshold. Action potentials are usually triggered at the axon hillock, the area where the axon meets the cell body. Synapses located at the axon hillock are more effective than those in dendrites and the cell body because synapses at the hillock...Group of answer choicesdirectly activate ion pumps causing a larger voltage change at the axon hillockincreases the driving (net) force on sodium at the axon hillock making sodium channels more likely to open for an action potentialbypass passive electrical spread over long distances causing a larger voltage change at the axon hillockincreases the chemical force acting on potassiumincreases the axon’s membrane resistance causing a larger voltage change at the axon hillock
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