The "dark current" describes which of the following
a. photoreceptors are depolarized in the dark because ion channels for cations like sodium and calcium are held open, allowing the influx of these cations/current
b. photoreceptors are depolarized in the dark because ion channels for cations like sodium and calcium are closed, allowing the influx of these cations/current
c. in the dark, photopigments regenerate making photoreceptors more sensitive to light
d. in the dark, photopigments regenerate making photoreceptors less sensitive to light
Ans: a. photoreceptors are depolarized in the dark because ion channels for cations like sodium and calcium are held open, allowing the influx of these cations/current
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