We also have proteins such as our fibrinogen, which is basically involved in a blood clotting process. And we have immunoglobulins, which are the antibodies that are used by our immune system. Number three, we also find nutrients such as amino acids, sugars, as well as fatty acids. And these are the nutrients that are required by the cell to basically make ATP, make proteins and fats. Number four, we find a balance of electrolytes. We have sodium, we have chloride, we have calcium, magnesium, bicarbonate and other ions.