ch. 15 17 Flashcards Preview

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Flashcards in ch. 15 17 Deck (143)
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91

2 photoreceptors found in the retina

rods and cones

92

very sensitive to light - night vision

rods

93

black and white vision

rods

94

see only general outlines

rods

95

conc is highest on periphery of retina

rods

96

why do rods only see general outlines

many rod nerve fibers converge and transmit impulses to brain on same nerve fiber

97

color vision

cones

98

sharp images and fine detail

cones

99

increase conc at fovea - detail vision

cones

100

decrease conc at periphery of retina

cones

101

why do cones have sharp images and fine details

nerves don't coverge like rods- can pinpoint stimulation accurately

102

a visual pigment

rhodopsin

103

where are rhodopsin located

in rods

104

what happens to rhodopsin in bright light

it breaks down; decomposes

105

what happens to rhodopsin in dim light

regenerated faster than its broken down; dark adapted

106

protein made of vitamin A

rhodopsin

107

where is color vision

in cones

108

what are the three types of cones

blue
green
red

109

occur through integration of info arriving from al 3 types of cones

color discrimination

110

one or more types of cones are nonfunctional

color blindness

111

what is the most common blindness

red green color blindness (red cones are missing)

112

3 regions of the ear

external ear
middle ear
internal ear

113

collects and directs sound waves

external ear

114

collect sound waves and transmit them to

middle ear

115

contains sensory organs for hearing and equilibrium

internal ear

116

pinna

auricle

117

fx. provides directional sensitivity

auricle

118

fleshly and cartilaginous outer ear

auricle

119

auditory canal

external acoustic meatus

120

channels sound toward

external acoustic meatus