Phys Ch. 12

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Question

Answer

During an action potential, voltage gated K channels open after voltage gated Na channels. What effect does this have on the membrane potential?

It becomes less positive and more negative

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A change in membrane potential insufficient to cause an action potential is known as a __ __.

subthreshold value

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What must happen in order for a chemical signal to change the membrane potential of a neuron (2)?

there must be a change in the number of open ion channels and in ion flow across the membrane

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The main activity of __ is nerve impulse conduction.

axons

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Rank the conduction velocity of the groups of nerve fibers from fastest to slowest: A. type A fibers B. type C fibers C. type B fibers

A. type A fibers, C. type B fibers, B type C fibers

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The regulation of the response of neurons to neurotransmitters is known as __.

neuromodulation

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The opposition to the movement of electrical charge is known as __.

resistance

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The "E" in EPSP stands for __, meaning that the potential makes the inside of the postsynaptic cell more __.

excitatory, positive

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A flow of electrical current called a(n) __ __ is generated within the initial segment of a neuron.

action potential

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A positive change in the membrane potential is called __.

depolarization

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During the __ __ an axon is either incapable of generating an action potential, or requires a larger than normal stimulus

refractory period

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Which electrical event immediately follows the binding of neurotransmitter molecules to chemically gated ion channels?

postynaptic potential

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The all or none law refers to the fact that action potentials will only occur if the initial segment reaches __.

threshold

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If several EPSPs occur at different synapses, they undergo __ __ at the initial segment.

spatial summation

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The relative difference in charge across the plasma membrane of a resting neuron is known as the __ __ __.

resting membrane potential

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Flow of which ion is the most common cause of repolarization?

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A nerve impulse that "jumps" from node to node is called __ conduction.

saltatory

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Acetylcholinesterase removes acetylcholine from the synaptic cleft via __.

hydrolysis

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Which type of axon requires more ATP to function? A. myelinated axon B. unmyelinated axon

B. unmyelinated axon

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Neuronal pools are made of: A. motor neurons B. interneurons C. sensory neurons

B. interneurons

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Creating and transmitting __ currents is central to the function or neuron physiology.

electrical

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The chemical concentration gradients of Na and K are maintained by the __ __.

Na/K pump

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The presence of a __ sheath increases the rate of impulse conduction.

myelin

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Graded potentials that occur in postsynaptic neurons are specifically called postsynaptic __. On the distal side of a synaptic cleft.

potentials

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Created by: khinson