Establish an equilibrium between free hormones and bound hormones.
Must be free hormones to diffuse through the capillary walls.
Usually bind only to specific types of plasma proteins.
Explanation;
Hormones are chemical signals produced in small amounts, and affect only specific tissues in the body, not all the cells in the body. Hormones can be proteins, glycolipids, polypeptides, or steroids.
Hormones that bind to plasma proteins bind reversibly, establish an equilibrium between free hormones and bound hormones, must be free hormones to diffuse through the capillary walls, and usually bind only to specific types of plasma proteins.