Please help with these two questions, thank you so much!!! Q29: A scientist injects a Na+ channel blocker into one of the nodes of ranvier of Neuron A. Neuron A then receives a series ofEPSPS at its dendrites that raise the membrane potential at the axon hillock to -55mV. What do we expect to happen?a. Neuron A fires an action potential but it does not propagate past the node that received the injectionb. Neuron A fires an action potential and it does propagate past the node that received the injectionC. Neuron A does not fire an action potentialQ30: A scientist injects a K+ channel blocker into one of the nodes of ranvier of Neuron A. Neuron A then receives a series ofEPSPS at its dendrites that raise the membrane potential at the axon hillock to -55mV. What do we expect to happen?O a. Neuron A fires an action potential but it does not propagate past the node that received the injectionO b.Neuron A fires an action potential and it does propagate past the node that received the injectionO C.Neuron A does not fire an action potential

Neurons have the capability of generating and transmitting nerves impulses in our body. The…

Q29: A scientist injects a Na+ channel blocker into one of the nodes of ranvier of Neuron A. Neuron A then receives a series of EPSPS at its dendrites that raise the membrane potential at the axon hillock to -55mV. What do we expect to happen? a. Neuron A fires an action potential but it does not propagate past the node that received the injection Neuron A fires an action potential and it does propagate past the node that received the injection O b. O c. Neuron A does not fire an action potential Q30: A scientist injects a K+ channel blocker into one of the nodes of ranvier of Neuron A. Neuron A then receives a series of EPSPS at its dendrites that raise the membrane potential at the axon hillock to -55mV. What do we expect to happen? Oa. Neuron A fires an action potential but it does not propagate past the node that received the injection O b. Neuron A fires an action potential and it does propagate past the node that received the injection Neuron A does not fire an action potential C.

Q29: A scientist injects a Na+ channel blocker into one of the nodes of ranvier of Neuron A. Neuron A then receives a series of EPSPS at its dendrites that raise the membrane potential at the axon hillock to -55mV. What do we expect to happen? a. Neuron A fires an action potential but it does not propagate past the node that received the injection Neuron A fires an action potential and it does propagate past the node that received the injection O b. O c. Neuron A does not fire an action potential Q30: A scientist injects a K+ channel blocker into one of the nodes of ranvier of Neuron A. Neuron A then receives a series of EPSPS at its dendrites that raise the membrane potential at the axon hillock to -55mV. What do we expect to happen? Oa. Neuron A fires an action potential but it does not propagate past the node that received the injection O b. Neuron A fires an action potential and it does propagate past the node that received the injection Neuron A does not fire an action potential C.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 7TYK: Which of the following does not contribute to propagation of action potentials? a. As the area...

See similar textbooks

Similar questions

The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.
Which of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.
An example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.
Place the steps of the action potential in order. 3. a brief reversal of membrane potential that travels along the axon mechanism that restores the resting membrane voltage and intracellular ionic concentrations 2.C reversal of the resting potential due to an influx of sodium ions 1. period during which potassium ions are diffusing out of the neuron because of a change in membrane permeability
A theoretical drug blocks Na* leak channels - what effect would this have on a neuron's resting membrane potential and why? Would this drug affect the neuron's ability to generate an action potential and why/why not?
neurotransmitters 1 In what way may drugs be used to affect neurotransmitters? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. A drug may prevent the binding of a neurotransmitterto a receptor. b, A drug may increase the amount of neurotransmitter released. A drug may prevent the release of aneurotransmitter, d. A drug may affect the degradation of a neurotransmitter Drugemay affect neurotranemitters usng al of the mechanismslsted. Unanswered
apucreceptors ava ble at the synapse are reflected in this number. Question 2: In this chapter, we discussed a GABA-gated ion channel that is permeable to Cl. GABA also activates a G-protein-coupled receptor called the GABA receptor, which causes potassium-selective B channels to open. What effect would GABAB receptor activation have on the membrane potential? GABAB receptor activation causes potassium-selective channels to open. As a result this bringhs the
Action potentials propagate in one direction because of: O K+ Voltage-gated Channels become inactive for a while O Nat Voltage-gated Channels become inactive for a while O K+ nongated Channels become inactive for a while O Nat nongated Channels become inactive for a while
B EPSP EPSP IPSP Y Axon hillock Axon Will it be likely to produce an action potential in neuron Y if there is repeated rapid and successive firing from neuron B? Why? What is the phenomenon called? What is the ionic basis of IPSP? Name ONE neurotransmitter that is likely to be released by inhibitory neuron C. One EPSP from neuron A depolarizes the initial segment of a neuron by +2 mV, one EPSP from neuron B is +3 mV. If there is a spatial summation of 3 EPSPS each from neurons A and B, will an action potential be generated in neuron Y? The resting membrane potential of Y is -70 mV and threshold is at -60 mV.
Match the stages of action potential with the appropriate image or description. 1. Resting membrane potential 2. Threshold 3. Depolarization 4. Repolarization 5. Hyperpolarization 6. Refractory period The potential difference that must be met in order for an action potential to be generated When the potential drops below resting level When the potential starts to decrease again after it has reached a maximum Occurs at -77 mV When the membrane is resetting and an action potential cannot yet be produced again When the sodium channels are open Occurs at -55 mV
Match the stages of action potential with the appropriate image or description. PICK AND MATCH FROM THESE 1. Resting membrane potential 2. Threshold 3. Depolarization 4. Repolarization 5. Hyperpolarization 6. Refractory period The potential difference that must be met in order for an action potential to be generated When the potential drops below resting level Location 3 on this image When the potential starts to decrease again after it has reached a maximum Location 4 on this image Occurs at -77 mV When the membrane is resetting and an action potential cannot yet be produced again When the sodium channels are open Occurs at -55 mV