Blood
Blood is one of the most important fluids in your body. It contains many vital nutrients, vitamins, hormones, oxygen, and aids in waste removal. The average person has over a gallon of blood. You can have one of four different types of blood (A, AB, B, and O), however, each type works relatively the same when it comes to the circulatory system. Blood consists of four main parts: plasma, red blood cells, white blood cells, and platelets.
Plasma is the liquid part, composed of mainly water, of the blood that makes up roughly half of the content. It holds many types of proteins necessary for blot to clot properly and can also contain nutrients. Plasma carries the blood cells through the blood vessels. The other half of bloods composition is the blood cells. Red blood cells are meant to be the main carriers of nutrients, wastes, and especially oxygen. Hemoglobin is the substance that allows red blood cells to carry much more oxygen than plasma could. White blood cells are used to fight disease and infection. They increase in numbers when the body detects and infection. Platelets are used in aiding blood clotting. Every type of blood cells are produced in bone marrow.
Plasma is the liquid part, composed of mainly water, of the blood that makes up roughly half of the content. It holds many types of proteins necessary for blot to clot properly and can also contain nutrients. Plasma carries the blood cells through the blood vessels. The other half of bloods composition is the blood cells. Red blood cells are meant to be the main carriers of nutrients, wastes, and especially oxygen. Hemoglobin is the substance that allows red blood cells to carry much more oxygen than plasma could. White blood cells are used to fight disease and infection. They increase in numbers when the body detects and infection. Platelets are used in aiding blood clotting. Every type of blood cells are produced in bone marrow.
http://www.biologymad.com/bloodcirc/BloodC12.gif