Blood is usually associated with the heart and blood vessels which are part of the circulatory system. As it circulates throughout the body, red blood cells carry oxygen to all parts of your body and they remove carbon dioxide. However, did you know that the blood has more than just one type of cell?
There are many components in the blood and each has a different function. The most abundant are red blood cells that carry oxygen. There are also little cell-like pieces called platelets that are essential in blood clotting. One of the most fascinating components of blood, and the reason why blood is featured on a tour of the immune system, are the white blood cells. These can be further divided into five types of cells which defend the body against bacteria, viruses and parasites. The blood cells are suspended in plasma, which consists mostly of water with clotting factors, cell nutrients, sugar, and hormones.
