Stimulation of Photoreceptors Flashcards
1
Q
What is the visual pigment of Rods?
A
Rhodopsin
2
Q
What are the 2 phases of excitation for Rods?
A
- Dark Phase 2. Light Phase
3
Q
What is the Dark Phase?
A
In the dark is when rhodopsin is formed & accumulates.
4
Q
What is the Light Phase?
A
When light is absorbed, rhodopsin breaks down (changing form).
Retinal & opsin separate (referred to as bleaching of the pigment) & ultimately causing the APs to be transmitted along the optic nerve.
5
Q
What occurs during the excitation of Cones?
A
Similar, but more complex than excitation of rods.
Visual pigments are formed by retinal + opsins forming blue, green, or red cones.
6
Q
How are intermediate colors formed?
A
Percieved by activation of more than one type of cone.
7
Q
How is white formed?
A
Percieved by activation of all of the cones equally.
