Question

Which of the following is not a formed element of blood? a. leukocyte b. eosinophil c. fibrinogen d. platelet

Short answer

The correct answer is c. Fibrinogen, as it is not a cellular component or formed element of blood.

Step-by-step solution

Understand each option

First, we need to understand each of the given options: a. Leukocyte: White blood cells that provide immune defense against foreign substances. b. Eosinophil: A type of leukocyte, involved in allergic reactions and parasitic defenses. c. Fibrinogen: A glycoprotein that is involved in blood clot formation. d. Platelet: Small cell fragments involved in clotting and preventing blood loss.

Identify the non-cellular component

Upon examining the options, note that leukocytes, eosinophils, and platelets are all cellular components of blood, playing roles in various bodily functions. In contrast, fibrinogen is not a cell or cell fragment but a glycoprotein involved in clot formation. It is a soluble protein that becomes insoluble fibrin during clotting.

Select the correct answer

Based on the above understanding, the correct answer is: c. Fibrinogen, as it is not a cellular component or formed element of blood.