BIO NMDCAT Receptors

nmdcat.online July 7, 2026

In complete darkness, the continuous release of the neurotransmitter glutamate by photoreceptors serves to

A. Excite all bipolar cells equally

B. Hyperpolarize the photoreceptor membrane

C. Inhibit ON-center bipolar cells

✓

D. Trigger action potentials in rods

📝 Explanation

In the dark, photoreceptors are depolarized and steadily release glutamate. This glutamate binds to inhibitory metabotropic receptors on ON-center bipolar cells, keeping them hyperpolarized (inactive) in the dark.

📖 Additional Information

Excite all bipolar cells equally
Hyperpolarize the photoreceptor membrane
Inhibit ON-center bipolar cells
Trigger action potentials in rods

In the dark, photoreceptors are depolarized and steadily release glutamate. This glutamate binds to inhibitory metabotropic receptors on ON-center bipolar cells, keeping them hyperpolarized (inactive) in the dark.

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