Blood protein that maintains the proper proportion and concentration of water in blood: A Bilirubin B Prothrombin C Fibrinogen D Albumin E Globulin

The blood protein that maintains the proper proportion and concentration of water in blood is:<br /><br />(D) Albumin<br /><br />Albumin plays a crucial role in maintaining the osmotic pressure of the blood, which helps to keep water within the bloodstream and prevents it from leaking into surrounding tissues.