HUMAN ANATOMY
6th Edition
ISBN: 9781260210262
Author: SALADIN
Publisher: RENT MCG
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Textbook Question
Chapter 13.3, Problem 10BYGO
Compare the signal conduction speed in myelinated fibers versus unyelinated ones. Why aren’t all nerve fibers in the body myelinated?
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Compare the signal conduction speed in myelinated fibers versus unmyelinated ones. Why aren’t all nerve fibers in the body myelinated?
Assume that two nerve fibers have the same diameter, but one is myelinated and the other is unmyelinated. The conduction of an action potential is most energy-efficient along which type of fiber?
Which of the following are the likely explanations for the failure of a postsynaptic neuron to trigger an action potential? Select all that apply.
The EPSPs are neutralized by the neurotransmitter
The summation of IPSPs and EPSPs is insufficient to depolarize the cell to threshold
The synapses generating the EPSPs are too close to the axon hillock
The synapses generating the EPSPs are too far from the axon hillock
Chapter 13 Solutions
HUMAN ANATOMY
Ch. 13.1 - Define receptor and effector. Give two examples of...Ch. 13.1 - Prob. 2BYGOCh. 13.1 - Prob. 3BYGOCh. 13.2 - What basic physiological properties do a nerve...Ch. 13.2 - Prob. 2AWYKCh. 13.2 - Prob. 4BYGOCh. 13.2 - Prob. 5BYGOCh. 13.2 - Prob. 6BYGOCh. 13.2 - Prob. 7BYGOCh. 13.3 - From memory, make your own table of the six kinds...
Ch. 13.3 - Prob. 9BYGOCh. 13.3 - Compare the signal conduction speed in myelinated...Ch. 13.3 - Prob. 11BYGOCh. 13.4 - Of all the methods of membrane transport described...Ch. 13.4 - Prob. 12BYGOCh. 13.4 - Prob. 13BYGOCh. 13.4 - Prob. 14BYGOCh. 13.4 - Prob. 15BYGOCh. 13.4 - Prob. 16BYGOCh. 13.4 - Prob. 17BYGOCh. 13.5 - Prob. 18BYGOCh. 13.5 - Prob. 19BYGOCh. 13.5 - What single adult structure arises from all five...Ch. 13.5 - Prob. 21BYGOCh. 13 - The body’s two principal mechanisms of internal...Ch. 13 - Prob. 13.1.2AYLOCh. 13 - The two divisions of the PNS and the two...Ch. 13 - Prob. 13.1.4AYLOCh. 13 - Prob. 13.2.1AYLOCh. 13 - Prob. 13.2.2AYLOCh. 13 - Prob. 13.2.3AYLOCh. 13 - Prob. 13.2.4AYLOCh. 13 - Prob. 13.3.1AYLOCh. 13 - Prob. 13.3.2AYLOCh. 13 - Prob. 13.3.3AYLOCh. 13 - The structure, composition, and function of the...Ch. 13 - The relationship of Schwann cells to the myelin,...Ch. 13 - Prob. 13.3.6AYLOCh. 13 - Prob. 13.3.7AYLOCh. 13 - How the velocity of a nerve singnal varies with a...Ch. 13 - Prob. 13.3.9AYLOCh. 13 - Prob. 13.4.1AYLOCh. 13 - Prob. 13.4.2AYLOCh. 13 - Three types of synapses defined by where the...Ch. 13 - Prob. 13.4.4AYLOCh. 13 - Prob. 13.4.5AYLOCh. 13 - Prob. 13.4.6AYLOCh. 13 - Prob. 13.4.7AYLOCh. 13 - Prob. 13.4.8AYLOCh. 13 - Prob. 13.4.9AYLOCh. 13 - Prob. 13.4.10AYLOCh. 13 - The four principal types of neural circuits...Ch. 13 - Prob. 13.5.1AYLOCh. 13 - Prob. 13.5.2AYLOCh. 13 - Prob. 13.5.3AYLOCh. 13 - Prob. 13.5.4AYLOCh. 13 - Prob. 13.5.5AYLOCh. 13 - Prob. 13.5.6AYLOCh. 13 - The integrative functions of the nervous system...Ch. 13 - Prob. 2TYRCh. 13 - Prob. 3TYRCh. 13 - Prob. 4TYRCh. 13 - Prob. 5TYRCh. 13 - Prob. 6TYRCh. 13 - Another name for the axon of a neuron is nerve...Ch. 13 - Prob. 8TYRCh. 13 - Prob. 9TYRCh. 13 - Which of the following appears earlier than all...Ch. 13 - Prob. 11TYRCh. 13 - Prob. 12TYRCh. 13 - Prob. 13TYRCh. 13 - Neurons receive incoming signals by way of...Ch. 13 - Prob. 15TYRCh. 13 - Prob. 16TYRCh. 13 - Prob. 17TYRCh. 13 - Prob. 18TYRCh. 13 - Prob. 19TYRCh. 13 - Prob. 20TYRCh. 13 - Prob. 1BYMVCh. 13 - Prob. 2BYMVCh. 13 - State a meaning of each word element and give a...Ch. 13 - Prob. 4BYMVCh. 13 - Prob. 5BYMVCh. 13 - Prob. 6BYMVCh. 13 - Prob. 7BYMVCh. 13 - Prob. 8BYMVCh. 13 - Prob. 9BYMVCh. 13 - Prob. 10BYMVCh. 13 - Briefly explain why each of the following...Ch. 13 - Prob. 2WWWTSCh. 13 - Prob. 3WWWTSCh. 13 - Briefly explain why each of the following...Ch. 13 - Briefly explain why each of the following...Ch. 13 - Briefly explain why each of the following...Ch. 13 - Prob. 7WWWTSCh. 13 - Briefly explain why each of the following...Ch. 13 - Prob. 9WWWTSCh. 13 - Briefly explain why each of the following...Ch. 13 - Suppose some hypothetical disease prevented the...Ch. 13 - How would nervous system function be affected if...Ch. 13 - What unusual characteristic of neurons can be...Ch. 13 - Prob. 4TYCCh. 13 - Prob. 5TYC
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardDescribe how action potentials are conducted by unmyelinated nerve fibers. Why is saltatory conduction in myelinated fibers more rapid?arrow_forwardWhich of the following would occur if a neuron was experimentally stimulated simultaneously at both ends? The action potentials would pass in the middle and travel to the opposite ends The action potentials would stop as they meet in the middle. The stronger action potential would override the weaker action potential. Summation would occur when the action potentials meet in the middle, resulting in a larger action potential.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_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_forwardHelp me pleasearrow_forward
- Assume that two nerves fibers have the same diameter, but one is myelinated and the other is unmyelinated. The conduction of an action potential is most energy-efficient along which type of fiber?arrow_forwardCompare and contrast the neuroglial cells that form the myelin sheaths in both the CNS and the PNS?arrow_forwardMultiple sclerosis (MS) is a disorder that causes the destruction of myelin sheaths surrounding neurons. People with MS display many symptoms, including slurred speech, double vision, and poor muscle coordination. What is the direct effect of MS on nerve impulse transmission? Select one: The movement of impulses along neurons is slower than normal. Dendrites cannot be stimulated by acetylcholine, therefore impulses are not generated in neurons. The threshold level of stimulation for neurons is greater than normal. Axons cannot sectete acetylcholine, therefore impulses are not able to travel across synapses. Oarrow_forward
- Which of the following glial cells provide myelin in the central nervous system?arrow_forwardImagine a neuron that has a thousand axonal terminals synapsing on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not fire an action potential. What could be a possible explanation as to why this could be?arrow_forwardIf you inhibit the closing of sodium channels what do you predict the effect on neuronal function will be? If you inhibit the closing of sodium channels what do you predict the effect on neuronal function will be? Hyper-excitability: more sodium ions flow into the cell, causing neurons to fire more readily Hypo-excitability: more sodium ions flow into the cell, causing neurons not to fire as readily Less sodium is pumped out of the cell, slowing down return to the resting state Sodium ions are toxic to neurons, leading to cell proliferationarrow_forward
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