What is the main function of proteins in plasma?

(N/A) Plasma proteins perform several critical functions:
$1$. $Albumin$: It is primarily responsible for maintaining the osmotic pressure of the blood,which helps in the regulation of water balance and $pH$ maintenance.
$2$. $Globulin$: These proteins are primarily involved in defense mechanisms,providing immunity and resistance against pathogens.
$3$. $Fibrinogen$: These are essential for the coagulation or clotting of blood,which prevents excessive blood loss during injury.