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Flashcards in Physiology Deck (16)
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1

In order to see an object, what 4 things must happen?

Pattern of object must fall on photoreceptors on retina
Light regulation
Energy transduction
Reception of electrical signals by brain

2

Which cells are involved in the direct vertical pathway for light signal transmission?

Ganglion cells
Bipolar cells
Photoreceptors

3

What are the 4 types of photoreceptors?

Rods
3 types of cones

4

Lateral connections in the retina aid signal transmission. How do horizontal cells assist?

Receive input from photoreceptors + project to other photoreceptors and bipolar cells

5

Lateral connections in the retina aid signal transmission. How do amacrine cells assist?

Receive input from bipolar cells + project to ganglion, bipolar and other amacrine cells

6

Light penetrates which cells of the retina first?

Ganglion cells

7

What is the purpose of photoreceptors?

Convert light energy to electrical/neural energy (transduction)

8

What is visual acuity and how is it determined?

Ability to distinguish two nearby points
Determined by photoreceptor spacing + refractive power

9

Rods help us see in which kind of light - dim or day light?

Dim light

10

Cones help us see in which kind of light - dim or day light?

Day light
(you eat ice cream CONES during the DAY)

11

There is more light convergence in the cones system. True/False?

False
More convergence in rods

12

There are more rods than cones. True/False?

True

13

Where are cones located?

On the fovea (centre of retina)

14

Cones are specialised and perceive specific wavelengths of light. True/False?

True

15

Where are rods located?

Peripheral retina

16

Rods have high/low visual acuity and cones have high/low visual acuity

Rods have low visual acuity and cones have high visual acuity