Â© iStockphoto.com /Eraxion. Antibodies. The lymph system is the body's drainage system. It is composed of a network of vessels and small structures called lymph nodes. The lymph vessels convey excess fluid collected from all over the body back into the blood circulation. Along the way, however, these fluids are forced to percolate through the lymph nodes so that they can be filtered.
Coulter is a city in Franklin County, Iowa, United States. The population was 281 at the 2010 census.
Black Hawk County is a county located in the northeastern part of U.S. state of Iowa. As of the 2010 census, the population was 131,090, making it the fourth-most populous county in Iowa. The county seat is Waterloo. Black Hawk County is included in the Waterloo-Cedar Falls, IA Metropolitan Statistical Area.