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Q57
(CDS-I/2013)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Human anatomy physiology
Answer Verified
Human blood is a viscous fluid. This viscosity is due to—
Result
Your answer:
—
·
Correct:
A
Explanation
The correct answer is Option 1: proteins in blood.
Viscosity refers to a fluid's resistance to flow. In human blood, viscosity is primarily determined by two factors: the concentration of formed elements (hematocrit) and the concentration of plasma proteins.
- Role of Proteins: Plasma proteins, especially fibrinogen and globulins, are large, complex molecules that interact with each other and blood cells. These interactions increase internal friction, significantly contributing to the blood's overall viscosity.
- Why other options are less accurate:
- While RBCs (Option 4) do impact viscosity, the question asks for the fundamental chemical constituent in the fluid medium. Proteins are the primary drivers of plasma viscosity itself.
- Platelets (Option 2) are too small and few in number to significantly affect fluid resistance compared to proteins.
- Sodium (Option 3) is an electrolyte that affects osmotic pressure but does not provide the structural complexity required to increase fluid friction.
Therefore, plasma proteins are the most significant chemical factor responsible for the viscous nature of blood.
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