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

1. Blood serum
2. Sample from the thoracic duct of lymphatic system
3. Whole blood from pulmonary vein
4. Blood plasma

Correct answer: Blood serum

Solution

Blood serum will not coagulate because it is the fluid left after clotting has already occurred, so it lacks fibrinogen and most clotting factors. Plasma can clot because it still contains these proteins, and whole blood from a vein can also clot.

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