Over half of your blood is a yellowish liquid called plasma.

Blood plasma is the liquid part of blood that holds cells in place. It is made of about 92% water and 7% proteins. These proteins include albumin for pressure and fibrinogen for blood clotting. The last 1% contains salts, sugars, fats, and hormones.Plasma acts as a delivery system for the body. It moves nutrients to tissues and carries waste like carbon dioxide to the lungs. It also moves urea to the kidneys so the body can get rid of it. Plasma contains antibodies that help the immune system fight infections.The liver produces most of the proteins found in plasma. This liquid also helps the body stay at the right temperature. It keeps the blood's pH level between 7.35 and 7.45. This balance is necessary for human cells to survive.Doctors use plasma to help people with severe burns or liver failure. They separate plasma from the rest of the blood using a process called plasmapheresis. Without plasma, the body could not transport the materials it needs to function.