Action Potential Practice Problems PDF

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for anatomy, this is practice problems for action potential...

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Action Potential Practice Problems 1. Put the following events related to the conduction of a signal from one neuron to the next in order, 1 being the first and 5 being the last. Assume the starting point is the AP arriving at the axon terminal of neuron 1 and the signal will be transmitted to another neuron. ____4___ Neuron becomes repolarized ____5___ Na+/K+ pump is active ____2___ AcH is released from neuron into the synaptic clef ____3___ Na+ rushes into the cell ____1___ Voltage gated Ca2+ channels open

2. Label the following events on the Action potential graph:

Word bank (Place the letter in the space provided): ___B___ Depolarization ____A____ Resting Membrane Potential ___D___ Hyperpolarization ____C____ Repolarization _____E___ Threshold

3. On the prior image, identify the point on the graph where the Na+ channels become inactive and the K+ channels open (place a star on this point). 4. Suppose there is a stimulus that is sufficient enough to reach threshold. What event happens next. a. b. c. d. e.

AcH is released into the synaptic clef Voltage gated K+ channels open allowing K+ out of the cell Na+/K+ pump become active to reestablish resting membrane potential Voltage gated Na+ channels open allowing Na+ into the cell The cell becomes repolarized.

5. Suppose there is a stimulus that is not sufficient enough to reach threshold. What event happens next. a. b. c. d. e.

AcH is released into the synaptic clef Voltage gated K+ channels open allowing K+ out of the cell Na+/K+ pump become active to reestablish resting membrane potential Voltage gated Na+ channels open allowing Na+ into the cell The cell becomes repolarized.

6. What is the term associated with the cells membrane becoming less positive, or going down? a. Repolarization b. Depolarization c. None of the above d. It depends on the context 7. Identify the true statement(s): a. A myelinated axon leads to slower conduction b. A cell becomes depolarized because of the influx of Na+ c. Ca2+ triggers the release of K+ into the synaptic clef d. Hyperpolarization occurs because the K+ channels are slow to close e. Choices B and D are true f. Choices A, B and C are true g. All of the above are true

8. Explain how the action potential goes from one area to the next as shown in the image. AKA how does it move from lef to right?

9. Use the image above to answer this question. Suppose an action potential has traveled from the first to the third region on the image (red bars). Even though the signal of depolarization has passed region 1 it still has work to do in order to be able to conduct another signal. What events happen afer a wave of depolarization pass any given area on the axon?

Repolarization Reestablishment of resting membrane potential

10. Identify why an action potential can’t go backwards. Hint: this can be found in one of the videos within the last few slides of the action potential video.

Turn the neuron 180 degrees, so it points the other way, and the action potential goes the other way....