Examlex
Lymph is kept moving in the larger lymph vessels by contraction of the ____________________ in their walls.
Light Rays
Streams of photons traveling in a straight line, which are the basis of vision and are instrumental in phenomena such as reflection and refraction.
Retina
A light-sensitive layer at the back of the eye that converts light into neural signals which are sent to the brain.
Cornea
The transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of the eye's optical power.
Lens
In the eye, a transparent structure located behind the iris that focuses light onto the retina to produce clear images.
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