The optic nerve is formed by axons that arise from the ________ retinal cells.
A) ganglion
B) photoreceptor
C) horizontal
D) amacrine
E) bipolar
Question 2
The human retina contains about ________ rods and about ________ cones.
A) 60 million; 3 million
B) 9 million; 120 million
C) 32 million; 320 million
D) 120 million; 6 million
E) 160 million; 3 million