Final answer:
The functions of maintaining blood pH, blood clotting, transporting cholesterol, and osmotic pressure are carried out by plasma proteins in the blood.
Step-by-step explanation:
The maintenance of blood pH, blood clotting, transportation of cholesterol, and maintenance of osmotic pressure are all functions of plasma proteins in the blood. These proteins, including albumin, globulins, and fibrinogen, play crucial roles in various physiological processes. Albumin helps to maintain osmotic pressure and fluid balance in the blood vessels. Globulins serve as antibodies in the immune response, and fibrinogen is critical in the blood clotting process. Furthermore, plasma proteins act as carriers for substances like cholesterol, aiding in their transport throughout the body.