Which protein accounts for 60% of the dissolved proteins in plasma and helps regulate osmotic pressure?

Albumin is the protein that accounts for a significant portion of the dissolved proteins in plasma, contributing to about 60% of the total protein content. Its primary function is to maintain oncotic pressure, which is crucial for regulating the movement of water between blood vessels and surrounding tissues. This role in osmotic pressure stabilization is vital for fluid balance in the body, ensuring that blood volume and tissue hydration are appropriately maintained.

Additionally, albumin serves as a carrier for various substances, including hormones, fatty acids, and drugs, further highlighting its importance in the circulatory system and overall metabolic processes. Its high concentration in plasma helps prevent excessive fluid leakage into the interstitial spaces, thereby playing a key role in cardiovascular health. In contrast, the other proteins listed, such as globulin, fibrinogen, and lipoprotein, have different primary functions, including immune response, blood clotting, and lipid transport, which do not involve the same level of impact on osmotic pressure regulation.