1 Mites live naturally on dogs, but any mite in sufficient quantity can cause skin problems.  Two common types of mites that can cause mange are Demodex canis, which causes demodectic mange, and Sarcoptes scabei, which causes sarcoptic mange.
Ad. One area in which osmoreceptors are found is in the brain, specifically inside the hypothalamus. They regulate the amount of vasopressin, a hormone which tells the kidneys to retain water, which is expressed by the hypothalamus.
This is where the photoreceptors are located. If you think of the eye as a camera, the retina would be the film. The retina also contains the nerves that tell the brain what the photoreceptors are seeing.. There are two types of photoreceptors involved in sight: rods and cones.