A drop of each of the following is placed separately on four slides. Which of them will not coagulate?

Explanation

If a drop of each of blood, serum, and plasma is placed separately on four slides, the serum will not coagulate.Serum is the liquid part of blood that remains after the blood cells and clotting factors have been removed. It does not contain fibrinogen, which is the protein that is responsible for blood clotting. As a result, serum will not coagulate. The thoracic duct is the largest lymphatic vessel in the body. It drains lymph from the lower body and returns it to the bloodstream. The lymph in the thoracic duct does not contain fibrinogen, which is a protein that is necessary for blood clotting. Therefore, the lymph in the thoracic duct will not coagulate. A drop of whole blood from the pulmonary vein will not coagulate. The pulmonary vein is a vein that carries oxygenated blood from the lungs to the left atrium of the heart. The blood in the pulmonary vein does not contain any fibrinogen, which is a protein that is necessary for blood clotting. Fibrinogen is produced in the liver and is released into the bloodstream when the body is injured. Fibrinogen binds to other fibrinogen molecules to form a mesh that traps red blood cells and platelets, which eventually forms a clot.