Which of the following is FALSE? In vertebrate sensory neurons, nerve impulses normally travel one way along an axon The resting potential of a neuron is maintained by membrane "pumps" actively transporting sodium into and potassium out of the cell Even in the 21st century, the "hard problem of consciousness" has yet to be solved Surgically severing the corpus callosum can result in patients with two brain hemispheres operating independently O White matter is myelinated and is found in both the brain and spinal cord The energy for the sodium-potassium pump O probably comes from the breakdown of ATP to ADP O The hindbrain existed prior to the forebrain (in evolutionary terms) O

Which of the following is FALSE? In vertebrate sensory neurons, nerve impulses normally travel one way along an axon The resting potential of a neuron is maintained by membrane "pumps" actively transporting sodium into and potassium out of the cell Even in the 21st century, the "hard problem of consciousness" has yet to be solved Surgically severing the corpus callosum can result in patients with two brain hemispheres operating independently O White matter is myelinated and is found in both the brain and spinal cord The energy for the sodium-potassium pump O probably comes from the breakdown of ATP to ADP O The hindbrain existed prior to the forebrain (in evolutionary terms) O

Anatomy & Physiology

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter15: The Autonomic Nervous System

Section: Chapter Questions

Problem 6ILQ: Watch this video (http://openstaxcollege.org/l/3Dmovies) to learn about the side effects of 3-D...

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Contrast the somatic nervous system with the ANS foreach of the following:a. number of neurons between the CNS and the effectororganb. location of neuron cell bodiesc. structures each innervatesd. inhibitory or excitatory effectse. conscious or unconscious controlf. neurotransmitter(s) used
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Which of the following conduct sensory impulses to theCNS from receptors in muscle or skin?a. general somatic efferent fibersb. general somatic afferent fibersc. general visceral afferent fibersd. general visceral efferent fibers
Regeneration 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?
The giant axon of the squid (Figure Q11–3) occu-pies a unique position in the history of our understandingof cell membrane potentials and nerve action. When anelectrode is stuck into an intact giant axon, the membranepotential registers –70 mV. When the axon, suspended in abath of seawater, is stimulated to conduct a nerve impulse,the membrane potential changes transiently from –70 mVto +40 mV.
Parkinson disease is the result of decreased levels of theneurotransmitter dopamine in the brain. However, thesepatients can’t take dopamine in drug form because the drugcannot reach the brain. What anatomic structure preventsthe drug from reaching the brain? How could these sameanatomic structures be beneficial to an individual underdifferent circumstances?
What is the autonomic nervous system and what activities distin-guish it from the somatic nervous system? Why can the autonomic nervous system be described as a “two-neuron” system
Which functional division of the nervous system wouldbe responsible for the physiological changes seen duringexercise (e.g., increased heart rate and sweating)?a. somaticb. autonomicc. entericd. central
For a neuron to fire an action potential, its membranemust reach ________.a. hyperpolarizationb. the threshold of excitationc. the refractory periodd. inhibitory postsynaptic potential
When stimulated by effective steady stimuli, sensory receptors :-a- continuously discharge impulsesb- stop discharging after a short timec- produce an initial high rate of impulse discharge followed by decline of this rated- differ in their response ; some types discharge continuously, while other types do not respond at all
A loss-of-function mutation in the ion channel responsible for thegeneration of end-plate potentials results in a diminished permeabilityof the ion channel. 1) How would you experimentally test the effect of the mutation on thefunctional properties of the cell (synapse)? You should discuss the typesof postsynaptic responses and physiological parameters you couldmeasure.
Ordinarily, a neuron’s trigger zone is activated before any other part ofan axon, so a wave of action potentials occurs as sodium channelsopen in the direction of the synaptic terminal. What would happen ifyou artificially stimulated an axon to reach threshold potential midwayalong its length rather than at the trigger zone?a. Action potentials would occur in the direction of the synapticterminal.b. No action potentials would occur.c. Action potentials would occur in the direction of the trigger zone.d. Both a and c are correct.