Visual System 2

Question 1

Which system has the following:
Most sensitive to light
Night vision
Low acuity
Achromatic
Peripheral retina

Answer 1

Rod system

Question 2

Which system has the following:
Less sensitive to light
Day vision
High acuity
Color vision
Central retina

Answer 2

Cone system

Question 3

What do the discs of the outer segments of the photoreceptors contain?

Answer 3

Visual photopigment

Question 4

What are the 2 visual photpigments?

Answer 4

Opsin and retinal

Question 5

In light or dark is 11-cis-retinal and opsin are bound together?

Answer 5

Darkness

Question 6

In darkness, what is produced?

Answer 6

cGMP

Question 7

What type of polarizations occurs when photoreceptors are stimulated by light?

Answer 7

Hyperpolarization

Question 8

In light, the 11-cis-retinal configuration is changed to all-trans, which is splitted away from _____

Answer 8

Opsin

Question 9

Opsin binds to and activates G-protein called __________ which activates a phosphodiesterase that hydrolyzes cGMP

Answer 9

Transducin

Question 10

Low cGMP levels cause a closure of Na+ channels —> Hyperpolarization —> less ___________ release

Answer 10

Glutamate

Question 11

All-trans-retinal detached from __________

Answer 11

Rhodopsin

Question 12

Which type of cones is between 400-500?

Answer 12

Blue cones

Question 13

Which type of cones is between 450-610?

Answer 13

Green cones

Question 14

Which type of cones is between475-650?

Answer 14

Red cones

Question 15

Bird have good or bad color vision?

Answer 15

Good

Question 16

What type of vision do domestic animals have?

Answer 16

Dichromatic vision

Question 17

Where is the lateral geniculate nucleus located in?

Answer 17

Thalamus

Question 18

Where is the primary visual cortex located?

Answer 18

Occipital lobe

Question 19

Right visual field projects to the _____ retina and the axons travel to the ______ lateral geniculate nucleus and to the _____ primary visual cortex

Answer 19

Left x3

Question 20

Left visual field —> to the ________

Answer 20

Right

Question 21

Circular muscle = _________

Answer 21

Constrictor

Question 22

Circular muscle = _________ _________

Answer 22

Parasympathetic innervated

Question 23

Radial muscle = _____

Answer 23

Dilation

Question 24

Radial muscle = ____________ innervation

Answer 24

Sympathetic

Question 25

In dim light the radial muscles =

Answer 25

Dilate

Question 26

In strong light the circular muscles =

Answer 26

Constrict