Final answer:
The liquid portion of anticoagulated blood is called plasma (b), consisting of water and various substances such as coagulation factors and antibodies.
Step-by-step explanation:
The liquid portion of anticoagulated blood is called plasma. When blood is centrifuged, the blood cells and platelets are forced to the bottom of the tube, leaving a layer of liquid on top. This liquid, plasma, constitutes about 90 percent water and contains substances necessary for homeostasis including electrolytes, nutrients, gases, waste products, hormones, and proteins such as antibodies and blood coagulation factors. Blood plasma differs from serum, which is plasma from which the clotting factors have been removed.