Chapter 12 Quiz

Quiz Content

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. The neuron converts an electrical signal to a chemical signal in the

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. Neurons that relay sensory signals to integrative centers of the CNS are called

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. Which glial cells function as metabolic intermediaries between capillaries and neurons?

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. Which term best describes the movement of ions across a membrane?

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. A decrease in the absolute value of the membrane potential toward zero is called

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. Which of the following actively contributes to the cell's membrane potential?

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. The time constant (τ) depends on the _______ of the membrane.

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. If a current pulse is generated on the membrane and creates a passive potential, which statement will be true?

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. The plasma membrane of a resting neuron is most permeable to which ion?

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. If ouabain was used to block Na+–K+-ATPase pumps,

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. In a typical neuron, which ion is in passive equilibrium across the cell membrane?

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. A stimulating depolarizing current that depolarizes the axon hillock just slightly negative to the threshold will

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. _______ channels govern the generation of an action potential.

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. Considering the cycle of an action potential, when is the permeability to K+ at its greatest?

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. Which statement regarding the action potential is false?

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. What allows the action potential to return to a repolarized state?

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. Which statement regarding cardiac pacemaker cells is false?

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. _______ are responsible for extending the time of the cardiac action potential relative to a neural action potential.

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. Which character of neurons affects conduction velocity the least?

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. In myelinated axons, action potentials occur

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