The "dark current" of photoreceptors refers to
A. the exit of K+ out of the cell when light is not hitting the cell.
B. the entry of Na+ and Ca2+ into the cell when light is not hitting the cell.
C. the entry of K+ into the cell when light is not hitting the cell.
D. the exit of Na+ and Ca2+ out of the cell when light is not hitting the cell.
Answer: B
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