Human blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Plasma represents fifty-five percent of blood. The solid part of blood contains red blood cells, white blood cells, and platelets.Viscosity CuriosityMaybe you are studying anatomy. Maybe its Halloween. Whatever the reason for your interest in blood. Here is an opportunity to make a scientific investigation of blood viscosity. And another big plus is that its also edible!Using materi