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Ch. 11 Introduction to the Nervous System and Nervous Tissue
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All textbooksErin C. Amerman 2nd EditionCh. 11 Introduction to the Nervous System and Nervous TissueProblem 11.6a

Chapter 11, Problem 11.6a

Explain what would happen if depolarization of the trigger zone led to a negative feedback loop instead of a positive one. (Connects to Chapter 1)

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Hey, everyone. Let's take a look at this question together. What is the direct effect of repolarization in a nerve cell? Is it answer choice A the sodium channels. Close answer choice B the potassium channels open. Answer choice C both answer choices A and B or answer choice D, none of the above. Let's work this problem out together to try to figure out which of the following answer choices best explains the direct effect of repolarization in a nerve cell. So in order to solve this question, we have to recall what repolarization refers to in a nerve cell to determine what the direct effect of that repolarization is. And we can recall that repolarization is caused by the closing of the sodium channels and the opening of the potassium ion channels in which the opening of those potassium ion channels results in the potassium ions leaving the cell. So that membrane potential becomes more negative or rep polarizes. So looking at our answer choices, which of the following is that direct effect of repolarization in a nerve cell. And we know that these sodium channels close and the potassium channels open. So answer choice C both answer choice A and B are correct is the most appropriate answer. Choice. Since the direct effect of repolarization involves both the closing of the sodium channels and the opening of the potassium channels. So answer choice C is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.
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Explain how an action potential is propagated down an axon in continuous conduction. Why is saltatory conduction faster than continuous conduction?

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Albert, the patient in question 3, takes the drug lithium, which reduces the permeability of the neuronal axolemma to Na+ (that is, it allows fewer Na+ to enter the axon). Predict the effect this would normally have on his neuronal action potentials. Do you think this drug would be beneficial or harmful, considering his condition?

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Fill in the blanks: The______is the period of time during which it is impossible to stimulate a neuron to have an action potential, whereas the______ is the period of time during which a larger-than-normal stimulus is required to elicit an action potential.

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Textbook Question

Which of the following statements best describes saltatory conduction?


a. Every section of the axolemma must be depolarized and triggered to generate an action potential.

b. The internodes must generate action potentials.

c. The dendrites and cell bodies propagate EPSPs toward the trigger zone.

d. Only the nodes of Ranvier must generate action potentials.

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Textbook Question

Identify the following as properties of electrical synapses (ES), chemical synapses (CS), or both (B).           


a. ______The plasma membranes of presynaptic and postsynaptic neurons are joined by gap junctions.          

b. ______Transmission is unidirectional and delayed.          

c. ______A presynaptic neuron and a postsynaptic neuron are involved.          

d. ______The use of neurotransmitters packaged into synaptic vesicles is required.          

e. ______Transmission is nearly instantaneous and bidirectional.

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