Chapter 50.3 (SKIP?)

Question 1

Photoreceptors

Answer 1

Light detectors all contain photoreceptors, cells that contain light-absorbing pigment molecules

Question 2

Compound Eyes:

Ommatidia

Answer 2

Insects and crustaceans have compound eyes, which consist of up to several thousand light detectors called ommatidia

Question 3

Single-Lens Eyes

Answer 3

Single-lens eyes are found in some jellies, polychaetes, spiders, and many molluscs

Question 4

Single-Lens Eyes

Iris & Pupil Changes

Answer 4

They work on a camera-like principle: the iris changes the diameter of the pupil to control how much light enters

Question 5

Bipolar Cells

Answer 5

In the dark, rods and cones release the neurotransmitter glutamate into synapses with neurons called bipolar cells

Question 6

Lateral Inhibition

Answer 6

Interaction among different cells results in lateral inhibition, enhanced contrast in the image

Question 7

Optic Chiasm

Answer 7

The optic nerves meet at the optic chiasm near the cerebral cortex

Question 8

Lateral geniculate Nucei

Answer 8

Most ganglion cell axons lead to the lateral geniculate nuclei

Question 9

Primary Visual Cortex

Answer 9

The lateral geniculate nuclei relay information to the primary visual cortex in the cerebrum

Question 10

Fovea

Answer 10

The fovea is the center of the visual field and contains no rods, but a high density of cones