What is the primary function of albumin in the blood?

Albumin is a crucial protein found in the blood, and its primary role is to maintain osmotic pressure. This is essential for regulating the balance of fluids between the blood vessels and surrounding tissues. By exerting osmotic pressure, albumin helps to keep fluid within the bloodstream, preventing it from leaking into the tissues, which can lead to edema (swelling). The ability of albumin to bind and transport various substances, including hormones and fatty acids, also plays a secondary role in maintaining overall fluid balance, but its primary function is the regulation of osmotic pressure. This is vital for proper cardiovascular and renal function, as well as for overall homeostasis in the body.