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The fovea contains only


A) rods in all animals.
B) cones in all animals.
C) rods in primates.
D) cones in primates.

E) A) and C)
F) B) and C)

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Before reaching the retina,light must pass through the


A) retinal epithelium.
B) optic disk.
C) vitreous humor and several layers of neurons.
D) vitreous humor,blood vessels,and several layers of neurons.

E) All of the above
F) B) and D)

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High frequency gratings have


A) few bars within a given distance.
B) many bars within a given distance.
C) large differences in intensity between adjacent bars.
D) small differences in intensity between adjacent bars.

E) C) and D)
F) A) and D)

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The ventral stream projects to the


A) parietal lobe and participates in the analysis of movement.
B) temporal lobe and participates in object recognition.
C) parietal lobe and participates in object recognition.
D) frontal lobe and participates in the analysis of movement.

E) None of the above
F) A) and B)

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Photoreceptors release which of the following neurotransmitters?


A) substance P
B) serotonin
C) GABA
D) glutamate

E) C) and D)
F) A) and D)

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The range of electromagnetic energy visible to humans falls between _________ nm.


A) 400 and 700
B) 100 and 600
C) 700 and 1,000
D) 1000 and 10,000

E) B) and C)
F) A) and B)

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Which of the following features do not contribute to the protection of the human eye?


A) the bony orbits
B) tears
C) the placement of the eyes toward the front
D) blinking

E) A) and C)
F) A) and D)

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