Question

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

• A. Blood plasma
• B. Sample from the thoracic duct of lymphatic system
• C. Blood serum
• D. Whole blood from pulmonary vein

Answer 1

The correct option is C

Blood serum

The correct option is C

Explanation of correct option:

1. In the coagulation process, the circulating substances in a fluid are turned into semi-solid insoluble gel.
2. Coagulation needs platelets, phospholipids, calcium, and coagulation factors.
3. During any cut or injury, these substances adhere to the damaged blood vessels, releasing chemicals which attract platelets thereby resulting in the formation of a platelet plug.
4. Serum is the portion of blood that remains after blood coagulates. It lacks the proteins required for coagulation to occur.
5. Blood plasma, samples from the thoracic duct of the lymphatic system, and whole blood from the pulmonary vein will have clotting factors so they will coagulate.

Final answer

Blood serum when placed on a glass slide will not coagulate.