Which of the following are proteins in the plasma? (Select all that apply.)
a. Electrolytes
b. Albumin
c. Globulin
d. Fibrinogen
e. Hemoglobin
f. Iron
ANS: B, C, D
Plasma proteins include clotting factors, albumin, and globulins. Clotting factors such as prothrombin and fibrinogen are synthesized by the liver and circulate until activated in the clotting mechanism. Albumin, also synthesized by the liver, helps maintain blood volume and blood pressure by pulling tissue fluid into the venous ends of the capillary networks. Alpha and beta globulins are synthesized by the liver to be carrier molecules for substances such as fats, and gamma globulins are the antibodies produced by lymphocytes. Electrolytes and iron are not proteins, and hemoglobin is in red blood cells, not plasma.
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