Each of the following is a correct relationship between action potential phase and channel status except Select one: O A. hyperpolarizing phase; Na channels open O B. repolarizing phase; K* channels open O C. depolarization; Na channels open O D. hyperpolarizing phase; K channels open O E. repolarizing phase; Na" channels closed

Each of the following is a correct relationship between action potential phase and channel status except Select one: O A. hyperpolarizing phase; Na channels open O B. repolarizing phase; K* channels open O C. depolarization; Na channels open O D. hyperpolarizing phase; K channels open O E. repolarizing phase; Na" channels closed

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 1RE: Conformational changes in channel proteins brought about by voltage changes are responsible for...

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Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)
Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?
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.
Each of the following is a correct relationship between action potential phase and channel status except Select one: O A. hyperpolarizing phase; K channels open O B. hyperpolarizing phase: Na channels open O C. depolarization: Na channels open OD.repolarizing phase: Na channels closed O E repolarizing phase: K channels open ch
If the response time of activation gates of both voltage gated sodium and potassium channels are same once induced by changes in membrane potential, what do you think will happen to generation of action potential when a strong (25 mV) graded potential reaches to axon hillock? Justify your answer with specific reasoning. thanks a lot in advance:)
Draw details of the repolarization phase of an action potential from the following descriptions of the sequences of AfterHyperPolarization (AHP) and AfterDePolarization (ADP) sequences. Make the distinct phases clear and noticeable (5 % each) A complex AHP consisting of a first component AHP, an ADP, and a second component AHP before repolarization to resting membrane potential a first fast AHP component, followed by a slower AHP, followed by a fast ADP, and a second late AHP component before repolarization to rest
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A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next
In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. Discuss the importance of threshold. How does this relate to the concept of APs being all or none?
A neuron with a resting membrane potential of -75 mV receives multiple inputs giving rise to the following post-synaptic potentials: -15 mV, 20 mV, -5 mV, 7 mV, and 22 mV. The threshold is -50 mV. What will be the outcome? An action potential (AP) will be generated because there are more positive than negative inputs а. b. No action potential because the presence of a single IPSP is sufficient to prevent an AP О с. An action potential (AP) will be generated because the sum exceeds the threshold O d. An action potential (AP) will be generated because the sum of inputs is a positive value Ое. No action potential (AP) will be generated because the sum of inputs is below the threshold
A loss-of-function mutation in the ion channel responsible for thegeneration of end-plate potentials results in a diminished permeabilityof the ion channel. 1) How would you experimentally test the effect of the mutation on thefunctional properties of the cell (synapse)? You should discuss the typesof postsynaptic responses and physiological parameters you couldmeasure.
Based upon the changes in permeability seen in the trace below and your knowledge of ion distributions across a cell, predict how ion movements would change during an action potential. Drag and drop each phrase into the appropriate box on the action potential trace. Drag the appropriate labels to their respective targets. Note: not all labels will be used. ►View Available Hint(s) Sodium (Na+) ions move to the axon Sodium (Na) ions move out of the axon Less potassium (K) ions move out of the axon Potassium (K) ions move out of the axon Potassium (K¹) ions move into the axon Sodium (Na) ions stop moving in Membrane potential (mv) +30 +10 0 -10- -30 -50 -70 -90 A PNa 0 PNa 5 6 1 PK Threshold PK 2 Reset Help