Card 2 / 60: The dark current of photoreceptors is so named since it flows in the dark. It was initially recorded between two extracellular electrodes one placed at the outer segment, and the other placed nearer to the inner segment. What ionic current is being measured here? (3 points): a) Ion responsible: b) Type of channel responsible: c) Subcellular localization of channel:
Answer:
a) Ion responsible: mostly Na+ b) Type of channel responsible: cyclicnucleotide (cGMP) gated c) Subcellular localization of channel: outer segment
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