Certain cells in the retina respond differently to the direction in which objects move. To understand how cells in the retina respond to different visual stimuli, the activity of a retinal ganglion cell was measured while a square moved across its visual field. Which statement best explains the increases in voltage during the periodic spikes? A. Depolarization of a neuron past a threshold voltage causes sodium channels to close. B. Depolarization of a neuron past a threshold voltage causes sodium channels to open. C. Depolarization of a neuron past a threshold voltage causes potassium channels to close. D. Depolarization of a neuron past a threshold voltage causes potassium channels to open.
Certain cells in the retina respond differently to the direction in which objects move. To understand how cells in the retina respond to different visual stimuli, the activity of a retinal ganglion cell was measured while a square moved across its visual field. Which statement best explains the increases in voltage during the periodic spikes?
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A.
Depolarization of a neuron past a threshold voltage causes sodium channels to close.
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B.
Depolarization of a neuron past a threshold voltage causes sodium channels to open.
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C.
Depolarization of a neuron past a threshold voltage causes potassium channels to close.
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D.
Depolarization of a neuron past a threshold voltage causes potassium channels to open.
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