HUMAN ANATOMY W/CONNECT 1YR >IP<
5th Edition
ISBN: 9781260234985
Author: McKinley
Publisher: MCG
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Chapter 14, Problem 11WYL
Summary Introduction
To determine:
The reason behind the lack of regeneration of axons in the CNS (central nervous system) as compared to the PNS.
Introduction:
The neuron and nerve are the structural components of the nervous system of the vertebrates. A neuron is composed of the axon, dendrite, and the body. The axon is a long thread-like fiber part of a neuron.
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Chapter 14 Solutions
HUMAN ANATOMY W/CONNECT 1YR >IP<
Ch. 14 - Together, what three functions do the CNS and PNS...Ch. 14 - Compare and contrast the meanings of afferent and...Ch. 14 - How do dendrites and axons differ in terms of...Ch. 14 - Prob. 4WYLCh. 14 - Prob. 5WYLCh. 14 - Prob. 6WYLCh. 14 - Prob. 7WYLCh. 14 - Prob. 8WYLCh. 14 - Prob. 9WYLCh. 14 - Prob. 10WYL
Ch. 14 - Prob. 11WYLCh. 14 - Prob. 12WYLCh. 14 - Prob. 13WYLCh. 14 - How is a diverging circuit different from a...Ch. 14 - Prob. 1MCh. 14 - Prob. 1MCCh. 14 - Neurons that have only two processes attached to...Ch. 14 - Prob. 3MCCh. 14 - Prob. 4MCCh. 14 - Prob. 5MCCh. 14 - Prob. 6MCCh. 14 - a. Neurolemmocyte b. Astrocyte c. Neuron d....Ch. 14 - Which type of neuronal pool uses nerve impulse...Ch. 14 - Prob. 9MCCh. 14 - Prob. 10MCCh. 14 - What are the three structural types of neurons?...Ch. 14 - Prob. 2CRCh. 14 - Prob. 3CRCh. 14 - Prob. 4CRCh. 14 - Prob. 5CRCh. 14 - Describe the arrangement and structure of the...Ch. 14 - Prob. 7CRCh. 14 - What are the differences between electrical and...Ch. 14 - Discuss the similarities and differences between...Ch. 14 - What are the basic developmental events that occur...Ch. 14 - Prob. 1DCRCh. 14 - Prob. 2DCR
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- Assume 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 is a synapse? Explain the difference between an excitatory and an inhibitory synapse.arrow_forwardRegeneration of a severed axon has a better chance forsuccess in the PNS than in the CNS. Why is regeneration inthe CNS less likely to succeed?arrow_forward
- Why are impulses transmitted more quickly down a myelinated axon than down an unmyelinated axon?arrow_forwardWhy is saltatory conduction along a myelinated axon faster than continuous conduction along an unmyelinated axon?arrow_forwardThe purpose of an action potential (AP) is to propagate a signal down the axon to the axon terminal. What happens once it reaches the axon terminal? Using the experiment showing recordings from the post-synaptic cell (endplate potentials), describe what happens when an AP reaches the axon terminal and subsequently transmits the signal to a neighboring cell. What does this tell us about chemical neurotransmission?arrow_forward
- Immediately after the repolarization phase of an action potential, the neuronal membrane is temporarily unable to respond to the stimulation of a second action potential, a phenomenon referred to as the refractory period. What is the mechanistic basis for the refractory period?arrow_forwardBesides the standard post- and pre-synapse that exchange information, non neuronal cell types also play a role in synaptic transmission. One of those are called astrocytes and can form a tripartite synapse. Explain the roles of astrocytes in synaptic transmission.arrow_forwardIdentify the charges (positive/negative) that appear on the inside AND the outside of an axon while at resting state. Explain 2 factors that contribute to the maintenance of this resting state.arrow_forward
- Can someone briefly explain how nerve impulses are initiated and transmitted , and why one -way conduction at synapses always happens .arrow_forwardWhat effect would you expect an antagonist that targets the voltage sensing domain of perisynaptic calcium channels of an inhibitory interneuron have on the firing frequency of a finically active neuron that interneuron synapses onto? Explain in detailsarrow_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_forward
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