Senses are the physical means by which all living things see，hear，smell，taste，and touch.Each sense collects information about the world and detects changes within the body.Both people and animals get all of their knowledge from their senses，and that is why senses are so important. All senses depend on the working nerve system.Our sense organs start to work when something stimulates special nerve cells，called receptors，in a sense organ.Once stimulated，the receptors send nerve impulses along sensory nerves to the brain.Your brain then tells you what