When all three cone populations are stimulated equally, we perceive There are three different types of cones, each one sensitive to different light energies

1. When all three cone populations are stimulated equally, we perceive

white.

2. There are three different types of cones, each one sensitive to different light energies. These cones are designated

red, green, blue.

3. Under which condition would the release of neurotransmitter by photoreceptors be greatest?

in a pitch-black room after 30 minutes

4. Retinal, a component of all the visual pigments, is made from __________.

vitamin A

5. Pupillary muscle groups are controlled by the ANS. Parasympathetic activation causes pupillary ________, and sympathetic activation causes ________.

constriction; dilation

6. Which of the following description applies to the term myopia?

nearsightedness

7. An area of the retina that contains only cones and is the site of sharpest vision is the

fovea.

8. The ________ covers most of the exposed surface of the eye.

conjunctiva

9. The human lens focuses light on the photoreceptor cells by

changing shape.

10. What structure changes the shape of the lens for far and near vision?

ciliary body