Homework Answers
Answer: (D) Each segment of the axon prevets the adjacent segments from firing.
Depolarization spread passively from one axonal segment to another by triggering the opening of voltage-gated Na+ channels and hence another action potential propogates. Refractory period prevent generation of another action potential because that the travelling AP cannot initiate another action potential in the retrograde direction since the anterograde terminal only have excitable region.
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QUESTION 35 Which of the following is NOT true regarding the propagation of action potentials O...
Which of the following statements best illustrates how Clostridium tetani affects Jackies nervous system? For the...
Which of the following statements best illustrates how Clostridium tetani affects Jackies nervous system? For the four that are false, explain why they are incorrect. Defend the one correct choice with adequate justification. By blocking Na+ voltage gated channels, the bacteria disrupt resting membrane potential of motor afferent neurons so that they are more likely to fire action potentials to facial muscles. The endotoxin prevents the influx of Na+ that is required during repolarization, decreasing action potentials carrying information related...
Which of the following statements about action potentials is incorrect? O a) During an action potential,...
Which of the following statements about action potentials is incorrect? O a) During an action potential, the efflux of Kions causes the inside of cells to become more positive (depolarized). B) When critical threshold is reached an action potential is triggered C) Voltage gated channels are required to reach critical threshold D) Sodium ions diffuse across the membrane to cause depolariza D U E)Kions continue to efflux after resting membrane is reached to cause repolarization ause
Multiple Choice Which of the following statements about action potentials is incorrect? During an action potential,...
Multiple Choice Which of the following statements about action potentials is incorrect? During an action potential, the efflux of K ions causes the inside of cells to become more positive (depolarized). B) When critical threshold is reached an action potential is triggered C) Voltage gated channels are required to reach critical threshold D) Sodium ions diffuse across the membrane to cause depolarization. E) K ions continue to efflux after resting membrane is reached to cause repolarization
ant Score: 10% Resources C Give Up? O Hint Check Answer of 10 Use the Action...
ant Score: 10% Resources C Give Up? O Hint Check Answer of 10 Use the Action Potential Transmission tab of the Membrane Potentials interactive to help you answer the question. What would happen to the action potential transmission if voltage-gated sodium (Na+) channels in the initial axon segment were abnormally far apart from one another? The action potential would propagate more quickly than normal because saltatory conduction enables the depolarization signal to jump between voltage-gated Na+ channels. The action potential...
During the propagation of an action potential, what would be the effect of a mutation in...
During the propagation of an action potential, what would be the effect of a mutation in the voltage-gated Na+-channels that does not allow “inactivation” phase to occur, such that these channels go directly from open to closed conformations? a) The neuron with the mutant Na+ channels will start letting in calcium ions and generate a calcium-based action potential that is stronger than the sodium-based action potential. b) The neuron with the mutant Na+ channel will exhibit a reverse electrochemical gradient...
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period...
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period 6. Absolute refractory period 7. Resting membrane potential 8. Continuous conduction 9. Saltatory conduction Choices A. a cell whose internal environment has an electrical charge equal to its external environment B. the process of a cell becoming positively charged C. the process of a cell becoming negatively charged D. an electrochemical change in the potential across a membrane that causes an electrical signal to...
Two neurons, A and B, synapse onto a third neuron, C. If neurotransmitter from neuron A...
Two neurons, A and B, synapse onto a third neuron, C. If neurotransmitter from neuron A opens ligand-gated channels permeable to sodium (Na) ions, and neurotransmitter from neuron B opens ligand-gated chloride (CI") channels, which of the following statements is true? Hint: Drawing a simple diagram may help visualize this scenario. Select one: a. An action potential in neuron A causes a depolarizing EPSP in neuron B. b. An action potential in neuron B causes a depolarizing EPSP in neuron...
Please help me with several of these questions, thank you very much. 1. During the propagation...
Please help me with several of these questions, thank you very much. 1. During the propagation of an action potential along the axon of a neuron, what is happening at the leading edge (the front) of the region of depolarization as it moves down the axon? a. Ligand-gated Na+channels are opening. b. Voltage-gated Na+channels are opening. c. Ligand-gated K+channels are opening. d. Voltage-gated Na+channels have become inactive and refractory. e. Voltage-gated Na+channels are closing. 2. During transcellular transport of glucose...
16. Which of the following explains the action of Epinephrine at the SA node? a) It...
16. Which of the following explains the action of Epinephrine at the SA node? a) It binds to Beta 1 receptors on the SA node increasing the strength of cardiac muscle contraction b) It binds to muscarinic receptors on the SA node prolonging repolarization c) It binds to beta 1 receptors on the SA node causing rapid opening of HCN causing the membrane increasing the frequency of action potentials 17. Which of the following describes the action of a cholinergic...
for each, what is the right answer? 30. When a neuron encodes the strength of a...
for
each, what is the right answer?
30. When a neuron encodes the strength of a stimulus, it does so by changing A) the frequency of action potentials. B) the duration of each action potential C) the polarity of every alternate action potential. D) the size of each action potential E) the direction of the action potentials along the axon. 31. The relative refractory period of an axon begins with A) activation of chemically-gated K+ channels. B) increasing Na+ flux...
Which of the following statements about action potentials is incorrect? O a) During an action potential, the efflux of Kions causes the inside of cells to become more positive (depolarized). B) When critical threshold is reached an action potential is triggered C) Voltage gated channels are required to reach critical threshold D) Sodium ions diffuse across the membrane to cause depolariza D U E)Kions continue to efflux after resting membrane is reached to cause repolarization ause
Multiple Choice Which of the following statements about action potentials is incorrect? During an action potential, the efflux of K ions causes the inside of cells to become more positive (depolarized). B) When critical threshold is reached an action potential is triggered C) Voltage gated channels are required to reach critical threshold D) Sodium ions diffuse across the membrane to cause depolarization. E) K ions continue to efflux after resting membrane is reached to cause repolarization
ant Score: 10% Resources C Give Up? O Hint Check Answer of 10 Use the Action Potential Transmission tab of the Membrane Potentials interactive to help you answer the question. What would happen to the action potential transmission if voltage-gated sodium (Na+) channels in the initial axon segment were abnormally far apart from one another? The action potential would propagate more quickly than normal because saltatory conduction enables the depolarization signal to jump between voltage-gated Na+ channels. The action potential...
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period 6. Absolute refractory period 7. Resting membrane potential 8. Continuous conduction 9. Saltatory conduction Choices A. a cell whose internal environment has an electrical charge equal to its external environment B. the process of a cell becoming positively charged C. the process of a cell becoming negatively charged D. an electrochemical change in the potential across a membrane that causes an electrical signal to...
Two neurons, A and B, synapse onto a third neuron, C. If neurotransmitter from neuron A opens ligand-gated channels permeable to sodium (Na) ions, and neurotransmitter from neuron B opens ligand-gated chloride (CI") channels, which of the following statements is true? Hint: Drawing a simple diagram may help visualize this scenario. Select one: a. An action potential in neuron A causes a depolarizing EPSP in neuron B. b. An action potential in neuron B causes a depolarizing EPSP in neuron...
for
each, what is the right answer?
30. When a neuron encodes the strength of a stimulus, it does so by changing A) the frequency of action potentials. B) the duration of each action potential C) the polarity of every alternate action potential. D) the size of each action potential E) the direction of the action potentials along the axon. 31. The relative refractory period of an axon begins with A) activation of chemically-gated K+ channels. B) increasing Na+ flux...
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