They are propagated down the length of the axon.
  • Action potentials in a given neuron are propogated _____
  • How does myelination affect the propagation of an action potential?
  • Action potentials travel in only one direction down an axon because sodium channels in the neuron are refractory.
  • Neurons store neurotransmitter molecules in vesicles located within
Synaptic terminals. Vesicles within synaptic terminals contain neurotransmitter that may be released into the synaptic cleft.
  • How does myelination affect the propagation of an action potential?
  • Neurons store neurotransmitter molecules in vesicles located within
  • Which of these causes the release of neurotransmitter molecules?
  • What might occur to an animal with an untreated lesion on its brain stem?
It would likely die. As the brain stem is responsible for most of the core bodily functions.
  • Neurons store neurotransmitter molecules in vesicles located within
  • What might occur to an animal with an untreated lesion on its brain stem?
  • What would occur if sodium channels remained open once membrane depolarization was complete?
  • How does myelination affect the propagation of an action potential?
an action potential reaching the end of the axon. When an action potential reaches the end of an axon, vesicles fuse with the plasma membrane and release neurotransmitter into the synaptic cleft.
  • Which of these causes the release of neurotransmitter molecules?
  • Which of the following brain regions is responsible for formation of new memories?
  • Which of the following is most likely to result in an action potential at a postsynaptic neuron?
  • Neurons store neurotransmitter molecules in vesicles located within
It speeds propagation because cations do not leak out of the membrane as they spread down the axon
  • How does myelination affect the propagation of an action potential?
  • Which of these causes the release of neurotransmitter molecules?
  • What might occur to an animal with an untreated lesion on its brain stem?
  • Neurons store neurotransmitter molecules in vesicles located within
Calcium
  • How is an action potential propagated down an axon after voltage-gated sodium channels open in a region of the neuron's membrane?
  • Action potentials travel in only one direction down an axon because sodium channels in the neuron are refractory.
  • Neurotransmitters are released from neurons in response to the increase in intracellular concentration of what ion?
  • The space between an axon of one neuron and the dendrite of another neuron is called a(n) _____.
synaptic cleft
  • Neurons store neurotransmitter molecules in vesicles located within
  • The space between an axon of one neuron and the dendrite of another neuron is called a(n) _____.
  • Neurotransmitters are released from neurons in response to the increase in intracellular concentration of what ion?
  • Which of the following brain regions is responsible for formation of new memories?
Action potentials travel in only one direction down an axon because sodium channels in the neuron are refractory.
  • Which of the following terms describes how a neuronal membrane's potential is altered in the presence of inhibitory signals?
  • Action potentials travel in only one direction down an axon because sodium channels in the neuron are refractory.
  • Action potentials in a given neuron are propogated _____
  • How is an action potential propagated down an axon after voltage-gated sodium channels open in a region of the neuron's membrane?
Sensory Neuron. Sensory neurons transmit information about the environment to the brain.
  • When you touch a warm plate of food being handed around the dinner table, the first type of neuron to be activated is a(n) _____.
  • What would occur if sodium channels remained open once membrane depolarization was complete?
  • How is an action potential propagated down an axon after voltage-gated sodium channels open in a region of the neuron's membrane?
  • Which of the following terms describes how a neuronal membrane's potential is altered in the presence of inhibitory signals?
The entry of sodium ions into the neuron and their diffusion to adjacent areas of the membrane causes those portions of the membrane to become depolarized and results in the opening of voltage-gated sodium channels farther down the axon, which release potassium ions to the outside, returning the charge to its previous state.
  • When you touch a warm plate of food being handed around the dinner table, the first type of neuron to be activated is a(n) _____.
  • Which of the following terms describes how a neuronal membrane's potential is altered in the presence of inhibitory signals?
  • Action potentials travel in only one direction down an axon because sodium channels in the neuron are refractory.
  • How is an action potential propagated down an axon after voltage-gated sodium channels open in a region of the neuron's membrane?
Membrane potential reaches threshold.Many voltage-gated Na+ channels open.Na+ ions rush into the cell.Membrane potential rises (depolarizes) rapidly.
  • Where in the neuron do action potentials begin?
  • Sequence of initiation of action potential
  • Which structure is not part of a neuron?
  • Which of these causes the release of neurotransmitter molecules?
The membrane depolarizes above a certain threshold potential. Influx of Na+ ions into the neuron can lead to membrane depolarization above the threshold potential; this event triggers the creation of an action potential.
  • Which event triggers the creation of an action potential?
  • Which of these causes the release of neurotransmitter molecules?
  • Action potentials in a given neuron are propogated _____
  • Sequence of initiation of action potential
Changes in the number, sensitivity, and placement of synapses
  • Which structure is not part of a neuron?
  • Action potentials in a given neuron are propogated _____
  • Where in the neuron do action potentials begin?
  • What is a key mechanism behind learning and memory?
Repolarization would occur, but much more slowly. While sodium ions would continue to move into the cell, potassium moving out would counteract it.
  • Which of the following is most likely to result in an action potential at a postsynaptic neuron?
  • Which of the following terms describes how a neuronal membrane's potential is altered in the presence of inhibitory signals?
  • What would occur if sodium channels remained open once membrane depolarization was complete?
  • What might occur to an animal with an untreated lesion on its brain stem?
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