Euthanizing pets increasing as vet costs rise. A dog may be a man's best friend, but in a staggering economy with rising costs of veterinary care, more Americans are choosing to put their pets to sleep instead of paying for expensive treatments. At.
Cone cells, or cones, are one of three types of photoreceptor cells in the retina of the eye. They are responsible for color vision and function best in relatively bright light, as opposed to rod cells, which work better in dim light.
Marieb Chapter 15 - The Special Senses. STUDY. PLAY. palpebrae, Protect the eyeballs from intense light, foreign particles and impact, An upper and lower fold of skin that provides protection from foreign particles, injury from the sun and intense light, and trauma. Both the upper and lower edges of the eyelids have small hairs or cilia.