In temporal summation. Select one: O A. IPSPS, but not EPSPS, are combined. O B. The postsynaptic cell's potential is a combination of two EPSPS arriving at a syne rapid succession. O C. Two synapses on different regions of a cell are stimulated at the same time. O D. A synapse is stimulated a second time after the effect of a first stimulus at the has been terminated. O E. The size of an action potential depends on the size of the stinmulus.

In temporal summation. Select one: O A. IPSPS, but not EPSPS, are combined. O B. The postsynaptic cell's potential is a combination of two EPSPS arriving at a syne rapid succession. O C. Two synapses on different regions of a cell are stimulated at the same time. O D. A synapse is stimulated a second time after the effect of a first stimulus at the has been terminated. O E. The size of an action potential depends on the size of the stinmulus.

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 3TYK: An example of a synapse could be the site where: a. neurotransmitters released by an axon travel...

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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.
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?
Watch this video (http://openstaxcollege.org/l/summation) to learn about summation. The process of converting electrical signals to chemical signals and back requires subtle changes that can result in transient increases or decreases in membrane voltage. To cause a lasting change in the target cell, multiple signals are usually added together, or summated. Does spatial summation have to happen all at once, or can the separate signals arrive on the postsynaptic neuron at slightly different times? Explain your answer.
In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.
Which of these is least likely to trigger an action potential in a post-synaptic cell? A)EPSPs and IPSPs arrive simultaneously at multiple synapses. B)The other choices are equally likely to trigger an action potential. C)Single EPSPs arrive simultaneously at multiple synapses. D)Multiple EPSPs arrive rapidly at a single synapse.
4 Which of the following would be an example of spatial summation that produces a depolarizing effect at the postsynaptic neuron? Resting membrane potential is -70 mV and threshold is -55 mV. Group of answer choices IPSP of 10 from neuron A followed in close succession by a 2nd IPSP of 5 from neuron A Simultaneous application of an IPSP of 5 from neuron A and an IPSP of 10 from neuron B Simultaneous application of an EPSP of 5 from neuron A and an EPSP of 10 from neuron B EPSP of 10 from neuron A followed in close succession by a 2nd EPSP of 5 from neuron A
Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
Post-tetanic Potentiation in synapses :-a- is due to increased Ca ++ concentration in postsynaptic neuronsb- is due to increased Ca ++ influx into presynaptic neuronsc- results from slow prolonged stimulation of synapsed- causes fatigue of the synapse
Describe the microstructure of a chemical synapse. Summarize what happens when an action potential arrives at a synapse.
Would anyone be able to explain these different channels? I would like an explanation as to why voltage gated membranes are associated with axon membranes (although it's prob because of membrane potential differences and depolarization/hyperpolarization?), why ligand gated channels are primarily at synapses (via neurotransmitters?), etc.
If 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 proliferation
What event triggers an action potential?a. Opening of sodium channelsb. Opening of delayed potassium channelsc. High concentration of negative ions outside the celld. Activation of the sodium–potassium pump5. Ordinarily, a neuron’s trigger zone is activated b