QuestionSBA
QuestionChoice
Na+ channels in rod cells close in response to light as rhodopsin is activated. This leads to hyperpolarisation of the cell and a subsequent decrease in synaptic glutamate release due to the closure of voltage-gated calcium channels.
10023686
b
Na+ channels in rod cells
QuestionChoice
Rod cells in the eye contain rhodopsin which is activated when light is shone onto it. This molecule closes Na+ channels, hyperpolarising the cell. This leads to a decrease in synaptic glutamate release due to the closure of voltage-gated calcium channels.
10023685
a
Rhodopsin
QuestionChoice
Drusen are yellow fat/protein deposits in the macular which cause photoreceptor loss, leading to dry age-related macular degeneration. This is pathological and is not usually found in healthy people, so has no role in normal visual pathways.
10023689
e
Drusen
QuestionChoice
Vitreous humour is the jelly-like substance in the posterior chamber of the eye that helps maintain the eye's shape and acts as a shock absorber. It is not involved in the phototransduction pathway.
10023687
c
Vitreous humour
QuestionChoice
Cone cells are activated by coloured lights. There are 3 types of cones: green cones, red cones and blue cones; all dedicated to detecting different wavelengths of light.
10023688
d
Cone cells
Concept
Chapter
2693
4508
Anatomy of visual pathways
Topic
152
Neuroscience
17135
A 64-year-old diabetic presents to the eye clinic complaining of some vision loss. The ophthalmologist shines a light into the patient's eye and diagnoses a cataract. The patient asks what is the cause of his inability to see specific parts of his visual field.

What is activated in the phototransduction pathway when white light is shone onto it?
a