Plasma proteins are essential components of blood, primarily found in the liquid part known as plasma. They play various roles, including maintaining blood pressure, transporting nutrients, and supporting the immune system. The main types of plasma proteins include albumin, globulins, and fibrinogen. Albumin helps regulate the osmotic pressure of blood, while globulins are involved in immune responses and transporting substances. Fibrinogen is crucial for blood clotting, helping to prevent excessive bleeding. Together, these proteins ensure proper physiological functions and overall health.