Rods are to ____ as cones are to ____.
a. the periphery; the fovea
b. red; blue
c. vertebrates; invertebrates
d. reading text; reading road signs
Question 2
Why is the Aplysia such a popular animal for single-cell studies of learning?
a. Aplysia have neurons that are virtually identical from one individual to another.
b. Aplysia have greater learning abilities than other invertebrates.
c. Aplysia have short-term learning but not long-term learning.
d. Aplysia have only two neurotransmitters, one excitatory and one inhibitory.
The small dorsal fin of this blue whale is just visible on the far left.
Image of a blue whale's tail fluke with the Santa Barbara Channel Islands in the background, Au
Common Blue Violet
Blue Heron
Distribution of Rods and Cones on the Retina
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig