Best Answer: The pupil size limits the the amount of light that enters the eye. There are also day-time photoreceptors, the cones, which occur with three kinds of photo-sensitive pigments, for red, yellow-green, and blue.
Those âdevotedâ dogs lying on their mastersâ graves? Theyâre depressed. âMany dogs are simply depressed for their whole lives because theyâre deprived of the normal amount of attention, exercise, and stimulation they need from day one. These humans wonât know they have a problem and wonât want the dog any livelier as that wouldnât fit in with their lifestyle,â says Tamara.
In addition, people who are depressed may suffer from certain physiologic signs, such as headache, palpitations, loss of sexual drive, indigestion, and cramping. Patients are considered to be clinically depressed when they experience symptoms that last for several weeks and are enough to disrupt their daily lives.