Answer
$Hyperpolarization$ results in the closing of Voltage-dependent $Ca^{2+}$ channels in the pre-synaptic region of the rod cell. The resulting decrease in ($Ca^{2+}$) diminishes release of an inhibitory neutotransmitter that suppresses activity in the next neuron of the visual circuit. When this inhibition is removed in response to a light stimulus, the circuit become active and visual centers in the brain are excited.
Work Step by Step
The neuronal signaling pathway in higher organisms consists of a series of neurons that relay information to the brain.
