The Lymphatic system basically is a system of tissues and organs that help rid the body of its toxins and unwanted materials. Its main purpose though its transport something called a Lymph that's kinda like a Trojan horse in the fact that it has white blood cells inside it to fight infection at the site of a wound.
Ethnocentrism refers to the tendency to see other people's culture i.e way of life such as mode of dressing, eating pattern, marital rites etc as INFERIOR, while ONLY your own culture is normal, natural and superior, and should therefore be adopted by all people.