For a neuron that is transmitting an action potential down the length of its axon, select all the correct statements. Schwann cells, a special type of glial cell, insulate axons, and hence increase the speed at which an electrical signal is transmitted along a neuron in the peripheral nervous system In the sequence of an action potential being triggered, the voltage-gated K+ channels open prior to the voltage-gated Na+ channels When an action potential is triggered, the opening of the voltage-gated Na+ channels serves to hyperpolarize the cell. Excitatory post-synaptic potentials can sum together to reach the threshold voltage, which will then trigger an action potential. Action potentials represent brief, local negative feedback loops.
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Schwann cells are a special type of glial cell that insulate axons and increase the speed at which an electrical signal is transmitted along a neuron in the peripheral nervous system. This statement is correct. Show more…
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When a neuron is stimulated sufficiently to cause an action potential, which of the following events occurs first in the axon? If you are uncertain of the answer, revisit the lecture video or refer to pages 930 and 931 in your text. gated ion channels close, preventing the movement of Na+ across the cell membrane K+ floods out of the cell via diffusion, depolarizing the cell membrane and initiating an action potential gated ion channels in the cell membrane open up, allowing Na+ ions to enter the cell K+ exits the cell via the Na+/K+ pump (with the help of ATP), thereby triggering an action potential True or False: the magnitude of an action potential, measured in mV across the cell membrane of a neuron, increases with increasing stimulus intensity.
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A neuron's ability to generate action potentials depends: Choice A., on the axon reaching threshold and the opening of voltage-gated sodium channels, allowing sodium to enter the axon. Choice B., on the axon reaching threshold and the opening of voltage-gated sodium channels, allowing sodium to leave the axon. Choice C., on the immediate opening of voltage-gated potassium channels once threshold has been reached, allowing potassium to leave the axon. Choice D., on the immediate opening of voltage-gated potassium channels once threshold has been reached, allowing potassium to enter the axon.
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An Excitatory Post Synaptic Potential (EPSP) occurs in which region of a neuron? Dendrites and cell body, axon hillock, axon, synapse. For each of the following sentences, choose the proper word or phrase from the two choices provided. An EPSP causes hyperpolarization/ depolarization of a presynaptic neuron/post-synaptic neuron. The mechanism for an EPSP is that ion-gated channels open/close, allowing Na+ ions to enter/exit. At some chemical synapses, channels also allow K+ ions to enter/exit the neuron. Using similar sentences as above, describe what occurs during an Inhibitory Post Synaptic Potential (IPSP):
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