Plasma is the liquid component of blood and contains two important proteins -- albumin and fibrinogen. If a blood vessel is damaged, fibrinogen goes through several chemical reactions to become a solid protein called fibrin, which forms a mesh or clot to stop escaping blood at the damage site. Albumin keeps water in the bloodstream to balance the amount of liquid in blood vessels. It also transports bilirubin to the liver. Red blood cells age and become damaged so they are broken down to form new cells. Bilirubin is a waste substance created as hemoglobin in the red blood cells breaks down.
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