alleryStart learning →What fraction of the oxygen in blood is carried dissolved in plasma?
AAbout 15 percent
BAbout 7 percent
CAbout 1.5 percent
DAbout 20 percent
Answer & Solution
Correct answer: C. About 1.5 percent
1. Oxygen is not very soluble in liquids, so plasma carries little of it.
2. Only about 1.5 percent of the total oxygen travels dissolved.
3. The rest is carried by haemoglobin inside erythrocytes.
4. The 7 and 20 percent figures belong to carbon dioxide transport routes, so they answer a different question.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.5 Transport of Gases_
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