Vision is perceived by which of the following sequential events?
I-The bound photopigment cis-retinal of the photoreceptor rods and cones dissociates in response to light,thus it indirectly activates the bipolar neurons and then ganglion cells.
II-The action potentials are propagated through the axons of ganglion cells,the stimuli thus are projected to the occipital region of the brain.
III-A negative charge in the opening of the canal depolarizes the receptor at the base,which causes release of neurotransmitter and increase activity of the sensory neurons.
A)I then III
B)III then II
C)III then I then II
D)I then II then III
E)I then II

Question

Quizplus · Accepted Answer

The correct sequence of events for vision perception is that first, the bound photopigment cis-retinal dissociates in response to light, thus activating the bipolar neurons and ganglion cells indirectly (I). The stimuli are then propagated through the axons of ganglion cells, and the signals are projected to the occipital region of the brain (II). Finally, the receptor at the base depolarizes, which causes the release of neurotransmitter and increases the activity of the sensory neurons (III). Therefore, the correct sequence is I (photoreceptor activation) followed by II (signal propagation to the brain). Option E (I then II) is the best choice.

Vision Is Perceived by Which of the Following Sequential Events