Describe the phototransduction process and distinguish photoreceptor activity in the dark versus the light as it relates to on-center bipolar cells. Include the following in your answer : photoreceptor, photopigment, depolarize, hyperpolarize, neurotransmitter, bipolar cell, ganglion cell, and occipital lobe

What will be an ideal response?


In the dark, the photoreceptors depolarize and release a neurotransmitter, causing the bipolar cell to hyperpolarize; thus, the bipolar cell is inhibited. In the light, the photoreceptor hyperpolarizes and stops releasing inhibiting neurotransmitter onto the bipolar cell. This allows the bipolar cell to depolarize and release a neurotransmitter onto the ganglion cell, which depolarizes in response. Action potentials are then sent along ganglion cell axons to the brain where they are perceived as light in the occipital lobe.

Anatomy & Physiology

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