The First Step in the Process of Photoreception Is

Question

The first step in the process of photoreception is
A) the bleaching of rods.
B) the bleaching of cones.
C) absorption of a photon by a visual pigment.
D) inhibition of the sodium pumps.
E) release of neurotransmitter.

Accepted Answer

Photoreception begins with the absorption of a photon by a visual pigment, which activates the pigment and triggers a series of chemical reactions that eventually lead to the generation of an electrical signal that can be transmitted to the brain. The bleaching of rods and cones, inhibition of the sodium pumps, and release of neurotransmitter are all subsequent steps in the process of photoreception.