Which component is not a formed element?

Which component is not a formed element?

• A. Platelets
• B. Red blood cells
• C. White blood cells
• D. Plasma proteins

Answer: (D)

Blood components are categorized as formed elements (cells and fragments) and plasma (the liquid portion). Red blood cells, white blood cells, and platelets are all cellular components or fragments of cells, so they are formed elements. Plasma proteins, on the other hand, are dissolved in the plasma and are not cells or fragments. They include albumin, globulins, and fibrinogen, which support functions like osmotic balance, immunity, and clotting, but they are not formed elements. So plasma proteins are the non-formed-element component.

Blood components are categorized as formed elements (cells and fragments) and plasma (the liquid portion). Red blood cells, white blood cells, and platelets are all cellular components or fragments of cells, so they are formed elements. Plasma proteins, on the other hand, are dissolved in the plasma and are not cells or fragments. They include albumin, globulins, and fibrinogen, which support functions like osmotic balance, immunity, and clotting, but they are not formed elements. So plasma proteins are the non-formed-element component.