alleryStart learning →Water accounts for what proportion of blood plasma by volume?
AAbout 92 percent
BAbout 72 percent
CAbout 55 percent
DAbout 99 percent
Answer & Solution
Correct answer: A. About 92 percent
1. Plasma is composed primarily of water, at about 92 percent by volume.
2. Proteins take up about 7 percent of plasma volume.
3. All the remaining non-protein solutes together contribute about 1 percent.
4. The three figures add to 100, which is a quick internal check that 92 percent is the right value for water.
_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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