Using the figure of an action potential provided, place the following main steps in the generation of an action potential in the correct order starting from the beginning of an action potential. +30- +10- -10- action -30- -50- Threshold -70- -90- 2 Time (msec) 3 a graded depolarization brings an area of an excitable membrane to threshold a temporary hyperpolarization occurs voltage-gated sodium (Na*) channels regain their normal properties sodium ions (Na+) enter the cell and further depolarization occurs voltage-gated sodium (Na*) channel activation occurs voltage-gated potassium (K*) channels fully open and potassium (K*) moves out of the cell, initiating repolarization Membrane potential (mV) > > > >

Using the figure of an action potential provided, place the following main steps in the generation of an action potential in the correct order starting from the beginning of an action potential. +30- +10- -10- action -30- -50- Threshold -70- -90- 2 Time (msec) 3 a graded depolarization brings an area of an excitable membrane to threshold a temporary hyperpolarization occurs voltage-gated sodium (Na) channels regain their normal properties sodium ions (Na+) enter the cell and further depolarization occurs voltage-gated sodium (Na) channel activation occurs voltage-gated potassium (K) channels fully open and potassium (K) moves out of the cell, initiating repolarization Membrane potential (mV) > > > >

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 17RE

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Similar questions

Draw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.
The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential.
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
A local anesthetic (Na+ channel blocker) should do which of the following Make the resting membrane potential more negative Decrease the after hyperpolarization Block the rising phase of the AP None of these
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 membrane potential (Vm) labeled axis on the graph In the graph draw the phases of the action potential Include the channels involved and when they open and close matching them to the Vm Indicate the periods in which the action potential can or cannot occur
At the peak of an action potential, would the relative permeability of Na be higher than K? Which ion would be the least permeable to the membrane during falling phase?
Describe the action potential in terms of the different functional states of the voltage- gated Na+ membrane channels (Note: there are three states)
Membrane Potential (mV) +35 0 -50 -70 0 A B C | 2 Time (milliseconds) 3 E 4 Use the figure showing phases of the action potential to answer the following question. Most of the voltage-gated sodium channels become open at label ____, and become inactivated at label
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
The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential. +40 B D membrane potential (mV) -40 -60 A { 2 time (ms)
What statement is NOT true about the length constant? is the distance along the dendrite from the site of current input to the site where Vm has decayed by 37% the decay of current by 37% over a specific segment along an axon the decay of membrane potential as a function of membrane and axial resistances the passive decay of current over distance