Human blood is a viscous fluid due to_________?
Correct answer: B. Proteins in blood
- A. Platelets in plasma
- B. Proteins in blood
- C. RBC and WBC in blood
- D. Sodium in serum
Explanation
Plasma proteins, especially fibrinogen and globulins, increase the internal friction of blood and therefore contribute substantially to its viscosity. Students may choose RBCs and WBCs because blood cells also affect flow resistance, but the standard answer for the viscous nature of plasma is its dissolved proteins.
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