Anatomy & Physiology
5th Edition
ISBN: 9780321861580
Author: Marieb, Elaine N.
Publisher: Pearson College Div
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Textbook Question
Chapter 11, Problem 16CYU
Events at a chemical synapse usually involve opening both voltage-gated ion channels and chemically gated ion channels. Where are these ion channels located and what causes each to open?
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What is long-term potentiation (LTP) and how does it occur? What changes in the cell should we expect to observe when a synapse is in a "potentiated" state?
At a synapse, opening one sodium channel (for the normal duration before closing) causes a small depolarization. Opening a handful of sodium channels may cause a larger depolarization. Opening more channels may lead to an even larger depolarization, up to a point. Then the depolarization would be the same regardless of how many other sodium channels opened. Explain why the number of open channels increases the depolarization, and why it doesn’t matter beyond a certain point.
What is an electrical synapse? Where can electrical synapses be found? Identify an advantage and a disadvantage of an electrical synapse compared to a chemical synapse.
Chapter 11 Solutions
Anatomy & Physiology
Ch. 11 - What is meant by integration, and does it...Ch. 11 - Which subdivision of the PNS is involved in (a)...Ch. 11 - Which type of neuroglia controls the extracellular...Ch. 11 - Which two types of neuroglia form insulating...Ch. 11 - MAKING CONNECTIONS Which part of the neuron is its...Ch. 11 - How does a nucleus within the brain differ from a...Ch. 11 - How is a myelin sheath formed in the CNS, and what...Ch. 11 - Which structural and functional type of neuron is...Ch. 11 - For an open channel, what factors determine in...Ch. 11 - For which cation is there the greatest amount of...
Ch. 11 - Which is bigger, a graded potential or an action...Ch. 11 - An action potential does not get smaller as it...Ch. 11 - Why does a myelinated axon conduct action...Ch. 11 - If an axon receives two stimuli close together in...Ch. 11 - What structure joins two neurons at an electrical...Ch. 11 - Events at a chemical synapse usually involve...Ch. 11 - Which ions flow through chemically gated channels...Ch. 11 - Prob. 18CYUCh. 11 - Prob. 19CYUCh. 11 - Why is cyclic AMP called a second messenger?Ch. 11 - Which types of neural circuits would give a...Ch. 11 - Prob. 22CYUCh. 11 - What pattern of neural processing occurs when we...Ch. 11 - Which of the following structures is not part of...Ch. 11 - Match the names of the supporting cells found in...Ch. 11 - Prob. 3RQCh. 11 - Assume that an EPSP is being generated on the...Ch. 11 - The velocity of nerve impulse conduction is...Ch. 11 - Chemical synapses are characterized by all of the...Ch. 11 - Biogenic amine neurotransmitters include all but...Ch. 11 - Prob. 8RQCh. 11 - Inhibition of acetylcholinesterase by poisoning...Ch. 11 - Prob. 10RQCh. 11 - An IPSP is inhibitory because (a) it...Ch. 11 - Identify the neuronal circuits described by...Ch. 11 - Explain both the anatomical and functional...Ch. 11 - (a) Describe the composition and function of the...Ch. 11 - (a) What is myelin? (b) How does the myelination...Ch. 11 - (a) Contrast unipolar, bipolar, and multipolar...Ch. 11 - What is the polarized membrane state? How is it...Ch. 11 - Describe the events that must occur to generate an...Ch. 11 - Prob. 19RQCh. 11 - (a) Explain the difference between an EPSP and an...Ch. 11 - Since at any moment a neuron is likely to have...Ch. 11 - The effects of neurotransmitter binding are very...Ch. 11 - Prob. 23RQCh. 11 - Prob. 24RQCh. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...
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- Why do neurotransmitters have to be removed from the synapse?arrow_forwardAssume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.arrow_forwardWhat are the criteria for identification of the neurotransmitter at a particular synapse? Which two criteria are sufficient to conclude that a candidate substance is a neurotransmitter?arrow_forward
- What is an action potential and how it is generated and propagated along an neuron? What happens when it reaches a chemical synapse?arrow_forwardIf a pre-synaptic cell releases a large amount of excitatory neurotransmitter into the synaptic cleft, how will that affect the PSPs? Does that large release ensure that the postsynaptic cell will initiate an action potential, and what role does the axon hillock play in this process/decision?arrow_forward
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