Serum is the liquid portion of clotted blood.

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Multiple Choice

Serum is the liquid portion of clotted blood.

Explanation:
Serum is the liquid portion of clotted blood because when blood forms a clot, the cells get trapped and the clotting factors (like fibrinogen) are consumed into the clot. After the clot is removed, the fluid that remains is serum. It contains water, electrolytes, antibodies, and many plasma proteins, but it does not include fibrinogen or other clotting factors because they’ve been used up in clot formation. If blood is drawn with anticoagulants and not allowed to clot, centrifugation yields plasma, which still contains fibrinogen and the clotting factors. The cells are the solid portion that is removed, not part of the liquid. Defining serum as plasma proteins isn’t precise, since serum is defined by the absence of clotting factors after clotting occurs.

Serum is the liquid portion of clotted blood because when blood forms a clot, the cells get trapped and the clotting factors (like fibrinogen) are consumed into the clot. After the clot is removed, the fluid that remains is serum. It contains water, electrolytes, antibodies, and many plasma proteins, but it does not include fibrinogen or other clotting factors because they’ve been used up in clot formation. If blood is drawn with anticoagulants and not allowed to clot, centrifugation yields plasma, which still contains fibrinogen and the clotting factors. The cells are the solid portion that is removed, not part of the liquid. Defining serum as plasma proteins isn’t precise, since serum is defined by the absence of clotting factors after clotting occurs.

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