alleryStart learning →How does the viscosity of blood compare with that of water?
AAbout five times as viscous as water
BAbout twice as viscous as water
CAbout the same viscosity as water
DAbout half as viscous as water
Answer & Solution
Correct answer: A. About five times as viscous as water
1. Viscosity measures a fluid resistance to flow.
2. Blood carries plasma proteins and formed elements that water does not, and both raise resistance to flow.
3. The result is a viscosity approximately five times greater than that of water.
4. This is why raised hematocrit forces the heart to pump harder.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.1 An Overview of Blood_
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