QUIZ 6

Question 1

what part of the eye results in a blind spot?

-optic disc
-retina
-macula
-fovea

Answer 1

optic disc

Question 2

an object located in the superior, temporal quadrant of the visual field would be mapped on which quadrant of the retina?

-nasal, temporal
-superior, nasal
-inferior, nasal
-inferior, temporal
-superior, temporal

Answer 2

inferior, nasal

Question 3

the reason that rods do not contribute to photopic vision is

-their response is saturated
-all of their membrane channels are open
-they have low resolution
-they are not responsible for color vision
-they are not being stimulated

Answer 3

their response is saturated

Question 4

the mechanism that accounts for light-induced hyperpolarization of photoreceptors is

-a decrease in the concentration of cGMP, leading to opening of potassium channels
-an increase in the concentration of cGMP, leading to closure of Na+ / Ca2+ channels
-a decrease in the concentration of cGMP, leading to closure of Na+ / Ca2+ channels
-an increase in the concentration of cGMP, leading to opening of potassium channels

Answer 4

a decrease in the concentration of cGMP, leading to the closure of Na+ / Ca2+ channels

Question 5

what is the major difference between ON-center and OFF-center bipolar cells that explains their opposite response to light increments?

-they have different GABA receptor types
-they release different neurotransmitters onto ganglion cells
-they have different glutamate receptor types
-ON-center cells have larger cell bodies

Answer 5

they have different glutamate receptor types

Question 6

what is the most direct path that light information travels on its way to the optic nerve?

-photoreceptor cell; ganglion cell; bipolar cell; optic nerve
-bipolar cell; photoreceptor cell; ganglion cell; optic nerve
-ganglion cell; photoreceptor cell; bipolar cell; optic nerve
-photoreceptor cell; bipolar cell; ganglion cell; optic nerve
-bipolar cell; ganglion cell; photoreceptor cell; optic nerve

Answer 6

photoreceptor cell; bipolar cell; ganglion cell; optic nerve

Question 7

ganglion cell axons cross at the ____, thus the ____ contains information from both eyes

-optic chiasm; optic nerve
-optic tract; optic nerve
-optic chiasm; optic tract
-optic tract; optic chiasm
-optic radiation; optic tract

Answer 7

optic chiasm; optic tract

Question 8

which of the following statements is true?

-the left visual field is represented in both sides of the primary visual cortex
-the left eye is represented in the left primary visual cortex only
-the left visual field is represented in the right primary visual cortex
-the left eye is represented in the right primary visual cortex only

Answer 8

the left visual field is represented in the right primary visual cortex

Question 9

neurons in the primary visual cortex respond selectively to which type of stimulus?

-changes in luminance
-bars or edges in a particular orientatino
-complex and irregular shapes
-light-dark spots

Answer 9

bars or edges in a particular orientation

Question 10

after a car accident, a man reports that he has lost his color vision. It is determined that his retina is still functioning normally even though he now sees in shades of gray. He most likely has sustained damage to area

-V4
-V2
-IT
-MT
-VP

Answer 10

V4