1. Cells that are triggered by light, vibrations, sounds,touch, or chemical substances are called ________.
       ganglioncells
       bipolarcells
       ossicles
       sensoryreceptors

2. When light waves enter the eye, theyfirst pass through the _________________.
       iris
       lens
       pupil
       cornea

3. Bundles of axons from ganglion cells makeup the ______.
       fovea
       opticnerve
       opticschism
       rods andcones

4. The place in the retina where the axonsof all the ganglion cells come together to leave the eye is calledthe ______.
       fovea
       blind spot
       opticchiasm
       opticnerve

5. The outer ear is called the_______________.
       pinna
       ovalwindow
       tympanicmembrane
       cochlea

6. The colored part of the eye that containsmuscles to contract or expand the pupil is the ______.
       lens
       iris
       fovea
       cornea