What happens to the simulated neuron (on Metaneuron) when a stimulus depolarises the neuron by 4 to 5 mV ? Try a range of stimulus 1 intensities to manipulate the resting membrane potential and, each time, drag the cursor over the yellow membrane potential trace to see the magnitude of the membrane voltage change achieved. Select the (one) correct answer. O a. A failed initiation occurs and action potential does not occur. O b. The neuron enters a refractory period. OC. An action potential is achieved. O d. The neuron becomes hyperpolarised.

What happens to the simulated neuron (on Metaneuron) when a stimulus depolarises the neuron by 4 to 5 mV ? Try a range of stimulus 1 intensities to manipulate the resting membrane potential and, each time, drag the cursor over the yellow membrane potential trace to see the magnitude of the membrane voltage change achieved. Select the (one) correct answer. O a. A failed initiation occurs and action potential does not occur. O b. The neuron enters a refractory period. OC. An action potential is achieved. O d. The neuron becomes hyperpolarised.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 2SQE

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Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.
Which of the following voltages would most likely be measured during the relative refractory period? +30 mV 0 mV -45 mV -80 mv
The extracellular sodium [Na+]0 is reduced in the saline bath. Following another current injection in a neuron, the membrane potential changes were recorded. a) Why has the membrane potential changed following the Na+ reduction? b) Why has the current injection produced no action potentials? c) How might you experimentally rescue action potential generation?
which of the following would be true (more than one can be true)? a) summation of A and X would reach threshold b) summation of C and A would be a graded potential c) stimulation by A would depolarize cell d) stimulation by B would be a subthreshold depolarization e) summation of B and C would be a graded potential with the net value of 12 mV depolarization
Suppose you placed an isolated neuron in a solution similar toextracellular fluid and later transferred the neuron to a solution lackingany sodium ions. What change would you expect in the resting potential?
During the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold
Can you explain to me why choice E is the correct answer and break down why the other options are false?Select the choice option that is TRUE regarding the absolute and relative refractory periods of the action potential (AP). A. The absolute refractory period occurs when the activation gate of voltage gated sodium channel closes at the peak of the AP B. The relative refractory period occurs when the inactivation gate of voltage gated sodium channels closes at the peak of the AP C. The relative refractory period occurs when the activation gate of voltage gated potassium channels opens at the peak of the AP D. The absolute refractory period may be overcome if enough excitatory stimulation is applied to the neuronal membrane E. All of the choice options are FALSE regarding the absolute and relative refractory periods of the AP
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Neuron 1 fires an action potential, releasing neurotransmitters to neuron 2. However, neuron 2 does not fire an action potential itself. Write: Explain two possible reasons for neuron 2 not firing.
Neuron 1 fires an action potential, releasing neurotransmitters to neuron 2. However, neuron 2 does not fire an action potential itself. Write: Explain two possible reasons for this observation.
What effect would you expect an antagonist that targets the voltage sensing domain of perisynaptic calcium channels of an inhibitory interneuron have on the firing frequency of a finically active neuron that interneuron synapses onto? Explain in details