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A drop of each of the following, is placed separately on four slides. Which of them will not coagulate?
A
blood serum
B
sample from the thoracic duct of lymphatic system
C
whole blood from pulmonary vein
D
blood plasma
Detailed Solution
Coagulation needs the clotting factors, the most important being fibrinogen, which is converted into insoluble fibrin threads.
Blood serum is plasma without the clotting factors: it is the pale yellow fluid left after the blood has clotted.
Since serum has no fibrinogen and other clotting materials, it cannot take part in clotting and will not coagulate.
Blood plasma contains fibrinogen, so it coagulates.
Whole blood from the pulmonary vein contains all the clotting factors and platelets, so it coagulates.
Lymph from the thoracic duct also contains fibrinogen and can clot, though slowly.
So the drop that will not coagulate is blood serum.
Blood serum is plasma without the clotting factors: it is the pale yellow fluid left after the blood has clotted.
Since serum has no fibrinogen and other clotting materials, it cannot take part in clotting and will not coagulate.
Blood plasma contains fibrinogen, so it coagulates.
Whole blood from the pulmonary vein contains all the clotting factors and platelets, so it coagulates.
Lymph from the thoracic duct also contains fibrinogen and can clot, though slowly.
So the drop that will not coagulate is blood serum.