The role of plasma is to transport blood cells and carry the substances needed to sustain human life activities as well as the waste products produced in the body. Plasma is the liquid component of blood, and the main role of plasma is to transport blood cells and to transport nutrients and metabolic wastes. The inorganic salts in plasma have a role in maintaining plasma osmotic pressure, ionic balance and neuromuscular excitability. Plasma also contains salts and enzymes, antibodies that help fight infection, proteins and clotting factors. Plasma helps transport clotting factors, proteins and enzymes to different places in the body, and is able to function as a humoral immune system, as well as helping to stop bleeding from wounds and prevent bleeding. It also helps to stop bleeding in wounds and prevent bleeding. It also helps the body to maintain normal blood pressure and blood volume levels. Therefore, the blood system is an important component of the human body. When there are problems with the blood system, it is recommended to consult a doctor for timely treatment and standardized treatment under the guidance of a professional doctor.