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.
They lower stress hormones: Hanging out with a dog after a stressful event reduces levels of the stress hormone cortisol. They can bring down your blood pressure: Stress is associated with accelerated heart rate and blood pressure. Pets promote relaxation and may help alleviate these stress symptoms. They let you step outside your own problems: When extra stressed, take your dog for a quick 10-minute walk.