Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 48, Problem 5TYU
Which of the following is the most direct result of depolarizing the presynaptic membrane of an axon terminal?
- (A) Voltage-gated calcium channels in the membrane open.
- (B) Synaptic vesicles fuse with the membrane.
- (C) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.
(D) An F.PSP or IPSP is generated in the postsynaptic cell.
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Chapter 48 Solutions
Campbell Biology (10th Edition)
Ch. 48.1 - Prob. 1CCCh. 48.1 - Describe the basic pathway of information flow...Ch. 48.1 - WHAT IF? How might increased branching of an axon...Ch. 48.2 - Under what circumstances could ions flow through...Ch. 48.2 - WHAT IF? Suppose a cell's membrane potential...Ch. 48.2 - MAKE CONNECTiONS Review Figure 7.10, which...Ch. 48.3 - How do action potentials and graded potentials...Ch. 48.3 - In multiple sclerosis (from the Greek skleros,...Ch. 48.3 - How do both negative and positive feedback...Ch. 48.3 - WHAT IF? Suppose a mutation caused gated sodium...
Ch. 48.4 - Prob. 1CCCh. 48.4 - Some pesticides inhibit acetylcholinesterase, the...Ch. 48.4 - Prob. 3CCCh. 48 - How would severing an axon affect the flow of...Ch. 48 - Suppose you placed an isolated neuron in a...Ch. 48 - Prob. 48.3CRCh. 48 - Prob. 48.4CRCh. 48 - Level 1: Knowledge/Comprehension 1. What happens...Ch. 48 - Level 1: Knowledge/Comprehension 1. What happens...Ch. 48 - Where are neurotransmitter receptors located? (A)...Ch. 48 - Why are action potentials usually conducted in one...Ch. 48 - Which of the following is the most direct result...Ch. 48 - Suppose a particular neurotransmitter causes an...Ch. 48 - WHAT IF? Ouabain, a plant substance used in some...Ch. 48 - Prob. 8TYUCh. 48 - DRAW IT Suppose a researcher inserts a pair of...Ch. 48 - EVOLUTION CONNECTION An action potential is an...Ch. 48 - Prob. 11TYUCh. 48 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 48 - Prob. 13TYU
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- Many neurons have only a single axon, but many terminals at the end of the axon. How does this end structure of the axon support its function?arrow_forwardEarly in an action potential, the inside of the axon becomes less negatively charged relative to the outside, this is called. Polarization Depolarization Hyperpolarization Repolarization ---------------------------------- Neurotransmitters -gated (ligand gated) ions channels are important for ____, while voltage gated ion channels are important for ____ Communication between neurons; communication within neurons communication within neurons; Communication between neurons ------------------------------- In gross neuroanatomy we are interested in structures that are NOT visible to the naked eye. True or false.arrow_forwardDescribe how following a threshold stimulus, a action potential is carried along an unmyelinated axon? How does this differ from an action potential passing through a mylenated axon?arrow_forward
- Why does an action potential move in an all-or-nothing fashion down the length of an axon without stopping?arrow_forwardSince all APs generated by a given nerve fiber have the same magnitude, how does the CNS “know” whether a stimulus is strong or weak?arrow_forwardUnmyelinated axons conduct action potentials without decrement, but when myelinated axons lose myelin in demyelinating diseases such as multiple sclerosis, conduction of action potentials is blocked. Why?arrow_forward
- If the middle of an axon were depolarized to threshold, in which direction could the action potential propagate?arrow_forwardJohn Hughes and Hans Kosterlitz identified the endorphin receptor in frogs, and concluded that animals have a "built in" opioid system. To make sure that endorphins are truly neurochemicals, which of the following question should we ask these gentlemen? Please select all that apply.a) Are endorphins released in response to presynaptic depolarization? b) Do endorphins interact with postsynaptic receptors? c) Are endorphins found in presynaptic cells? d) Are endorphins subject to reuptake?arrow_forwardIf an excitatory neurotransmitter binds to the post-synaptic neuron, what type of an event will that cause? What happens if the neurotransmitter is an inhimitory neurotransmitter? What type of ion will move into the post-synaptic neuron? What type of polarizing event will occur? and What happen at the axon hillock?arrow_forward
- You observe that a neuron treated with a metabolic inhibitor which prevents ATP generation still can generate action potentials even when the cell has little ATP, but the neuron eventually loses the ability to generate action potentials. What does this tell you about the direct mechanism for regenerating the resting potential after an action potential?arrow_forwardDoes the action potential in a single axon increase in amplitude when the stimulus amplitude is increased? Does the amplitude of the CAP increase because more fibers are firing, or the amplitude of the action potentials from single fibers are increasing, or a combination of both?arrow_forwardThe axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential? A. Na+ channels close in a voltage-dependent manner B. Na+ channels close in a time-dependent manner C. Na+ channels close in a chemically-dependent manner D. Na+ channels open in a voltage-dependent mannerarrow_forward
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