What is the term for the fluid portion of whole blood that have clotting proteins removed (when whole blood is allowed to clot)?

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The question asks for the term describing the fluid portion of whole blood after it has clotted and the clotting proteins have been removed.
Option 1: Serum. This is the standard term for the liquid that remains once a clot has formed and the fibrin and clotting factors are no longer in solution; it contains the cells, plus dissolved substances, but lacks fibrinogen and many clotting factors.
Option 2: Plasma. Plasma is the liquid component of blood when it is prevented from clotting; it contains clotting factors such as fibrinogen. Since the scenario specifies that clotting proteins are removed, plasma is not the correct term here because it represents blood that hasn’t clotted.
Option 3: PCV. PCV stands for packed cell volume (also called hematocrit), which measures the proportion of blood volume occupied by red cells. It is not a fluid portion of the blood and does not describe a liquid after clotting.
Option 4: Buffy coat. The buffy coat is the thin layer between plasma and red blood cells after centrifugation and comprises white blood cells and platelets; it is a cellular component separation, not the liquid fraction after clotting.
Taken together, think of serum as the liquid left after the clot forms and the clotting proteins are removed, whereas the other options refer to either components present during clot prevention (plasma), cellular fractions (PCV and buffy coat), or components not corresponding to the post-clotting liquid.

VT120 Assignment: Blood and Lymph - DUE 1/20 BY MIDNIGHT

What is the term for the fluid portion of whole blood that have clotting proteins removed (when whole blood is allowed to clot)?

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