Abstract
Rods turn light into a signal that is transmitted across electrical synapses made with neighboring rods and chemical synapses made with horizontal and bipolar cells. Several currents traversing a rod's inner-segment membrane modify the signal and influence synaptic transmission. One, a voltage-activated calcium current, has two functions: 1) it makes an important contribution to controlling the membrane potential during darkness, and 2) it probably regulates the exocytosis of synaptic vesicles. When the two functions are explored, a paradox develops. This can be seen if I describe each function in turn.
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