alleryStart learning →What fraction of carbon dioxide is carried bound to haemoglobin?
AAbout 7 percent of it
BAbout 70 percent of it
CAbout 20 percent of it
DAbout 50 percent of it
Answer & Solution
Correct answer: C. About 20 percent of it
1. About 20 percent of carbon dioxide is bound by haemoglobin and carried to the lungs.
2. This bound form is carbaminohaemoglobin.
3. Adding the three routes gives roughly 7 to 10 percent dissolved, 70 percent as bicarbonate and 20 percent bound.
4. So the third option is correct, and 7 percent belongs to the dissolved route.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.5 Transport of Gases_
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