Anatomy Exam 3
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| During which phase of an action potential are voltage-gated K+ channels open, while voltage-gated Na+ channels are closed? | Repolarizing phase
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| All gated Na+ and K+ channels are closed | Resting State (First stage)
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| Na+ channels open, allowing Na+ entry | Depolarization (Second stage)
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| Na+ channels are inactivating. K+ channels open, allowing K+ to exit. | Repolarization (Third stage)
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| Some K+ channels remain open, and Na+ channels reset | Hyperpolarization (Fourth stage)
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| Which statement best describes the role of leakage (nongated) channels? | Leakage channels help maintain the resting membrane potential.
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| Which of the following best describes the all-or-none phenomenon? | An action potential occurs completely when threshold is met and does not happen at all if threshold is not met.
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| A stimulus that fails to generate an action potential is called a ________. | subthreshold stimulus
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| All voltage-gated Na+ and K+ channels are closed during which of the following stages? | The resting state of a neuron
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| A neuron will not respond to a second stimulus of equal strength to the first stimulus to which it has already responded because __________. | the neuron is in the refractory period
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| Saltatory conduction refers to _______. | a conduction process in myelinated axons where the electrical signal appears to jump from gap to gap along the axon
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| Multiple sclerosis is __________. | an autoimmune disease that leads to destruction of the myelin sheaths in the CNS
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| Which of the following describes a change of membrane potential from -70mV to -75mV? | Hyperpolarization
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| Excessive potassium efflux as a result of relatively slower closure of the potassium gates corresponds to what part of an action potential curve? | The hyperpolarization phase of an action potential
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| How can the central nervous system determine whether a particular stimulus is intense or weak? | Stronger stimuli generate action potentials more frequently than weaker stimuli.
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| Which of the following membrane ion channels open and close in response to changes in the membrane potential? | Voltage-gated channels
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