Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 9 of 99
The plasma protein fibrinogen plays an essential physiological role in:
A
Cellular respiration
B
Osmotic regulation
C
Blood clotting
D
Immunity against viruses
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Blood clotting
Concept: Hemostasis and blood plasma proteins.

Solution: Fibrinogen is a soluble plasma protein produced by the liver. During the coagulation cascade, thrombin cleaves fibrinogen into insoluble fibrin threads that mesh together to form a blood clot.

Why other options are incorrect:
  • Option A: Respiration is carried out primarily by erythrocytes transporting oxygen.

  • Option B: Albumin is the chief protein driving plasma oncotic pressure.

  • Option D: Globulins (immunoglobulins) mediate antibody defenses.

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