Blood Plasma · Histology

What is the primary histological difference between plasma and serum?

  1. Serum contains more water than plasma
  2. Plasma lacks clotting factors like fibrinogen, while serum retains them
  3. Plasma is found only in the lymphatic system
  4. Serum is plasma that has lost fibrinogen to clotting
Show answer and explanation

Correct answer: Serum is plasma that has lost fibrinogen to clotting

Serum is defined as plasma minus the clotting factors. When blood clots, fibrinogen is converted to fibrin, leaving behind serum as the remaining liquid supernatant.

Difficulty: Medium Question 3 of 20

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