1 3 Which of the following rows correctly identifies the number that represents the location of the synapse, and the method of signal transmission across the synapse, respectively? Synapse Method of Transmission 1 Sodium and potassium ions D. Synapse Method of Transmission 1 Neurotransmitters Synapse Method of Transmission 2 Sodium and potassium ions d. Synapse Method of Transmission Neurotransmitters

1 3 Which of the following rows correctly identifies the number that represents the location of the synapse, and the method of signal transmission across the synapse, respectively? Synapse Method of Transmission 1 Sodium and potassium ions D. Synapse Method of Transmission 1 Neurotransmitters Synapse Method of Transmission 2 Sodium and potassium ions d. Synapse Method of Transmission Neurotransmitters

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 8TYK: Which of the following statements best describes saltatory conduction? a. It inhibits direct...

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Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.
Which of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.
View the University of Michigan Webscope (http://openstaxcollege.org/l/nervefiber) to see an electron micrograph of a cross-section of a myelinated nerve fiber. The axon contains microtubules and neurofilaments, bounded by a plasma membrane known as the axolemma. Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. What aspects of the cells in this image react with the stain that makes them the deep, dark, black color, such as the multiple layers that are the myelin sheath?
An example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.
1. Which of the following is the rapid upstroke in the action potential? A. Phase 0 B. Phase 1 C. Phase 2 D. Phase 3
Answer the following questions regarding conduction of action potentials using the velocities given on p. 100: a. How long would it take for an action potential to travel 0.6 m along the axon of an unmyelinated neuron of the digestive tract? b. How long would it take for an action potential to travel the same distance along the axon of a large myelinated neuron innervating a skeletal muscle? c. Suppose there were two synapses in a 0.6 m nerve tract and the delay at each synapse is 1 msec. How long would it take an action potential and chemical signal to travel the 0.6 m now, for both the myelinated and unmyelinated neurons? d. What if there were five synapses?
1. Action potentials are generated in a region called the _______ which includes the axon hillock and the initial segment of the axon. 2.According to the all-or-nothing principle a.once the electrical impulse reaches a certain level of intensity (its threshold), it fires and moves all the way down the axon without losing any intensity. b.the amount of time a neuron must “rest” in between firing episodes is stable. c.as a person ages, his or her neurological system slows down and the intensity of neural impulses decreases significantly. d.if all the neurons in a network are not integrated, the “message” carried by the neurons will be lost.
Identify the following as properties of electrical synapses (ES), chemical synapses (CS), or both (B). a. _____ The plasma membranes of presynaptic and postsynaptic neurons are joined by gap junctions. b. _____ Transmission is unidirectional and delayed. c. _____ A presynaptic neuron and a postsynaptic neuron are involved. d. _____ The use of neurotransmitters packaged into synaptic vesicles is required. e. _____ Transmission is nearly instantaneous and bidirection
Which of the following is the role of axonal Calcium (Ca2+) channels in neuronal communication at the synapse? a) they inhibit the action potential causing it to stop b) Calcium channels have no role in this process c) by allowing calcium to exit the cell, they promote the propagation of action potential across the synapse by creating depolarization d) by blocking calcium entrance, they mediate the contraction of presynaptic axon to facilitate movement e) when they open, calcium enters the presynaptic terminal, promoting fusion of neurotransmitter vesicles with presynaptic membrane, and release of neurotransmitters to the synaptic cleft
I have stimulated a neuron with dopamine for a second followed by treating it with cocaine and calcium chelating agent (which chelates out all calcium from the system making them unavailable for function), what will be the effect of such impulse on generating an action potential in the post-synaptic neuron? Will it be different if I pretreat the set of nerve cells with cocaine and calcium chelating agent followed by stimulating the neuron with dopamine? Justify your answer with proper reasoning in brief.
Sequence the following list of events of a neuronal action potential by placing 1 next to the first event, 2 next to the second event, and so on. a. _____ The activation gates of voltage-gated Na+ channels open, Na+ flood the cytoplasm, and depolarization occurs. b. _____ K+ continue to flow out of the axon until the membrane is hyperpolarized. c. _____ Local potentials cause the membrane to depolarize to threshold. d. _____ The inactivation gates of voltage-gated Na+ channels close as voltage-gated K+ channels open, K+ begin to exit the axon, and repolarization begins. e. _____ Repolarization continues and Na+ channels return to resting
What statement about synapse activity is false? A.The input of sodium ions by AMPA receptors is triggered by glutamate binding to the same receptors.B.Calcium entering the dendritic spine during synaptic transmission activates proteins that can potentiate synapse.C.Depolarization of the membrane caused by the arrival of calcium ions makes it possible to eject sodium blocking NMDA receptors.D.Glutamate can be released by the pre-synaptic button following the arrival of an action potential via the axon.