NEETBiologyBreathing and Exchange of GasesMCQ+4 / −1
What is true about RBCs in humans?
- AThey carry about 20-25 percent of CO2.
- BThey transport 99.5 percent of O2.
- CThey transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma
- DThey do not carry CO2 at all.
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Correct answer: A
Blood is the medium of transport for O2 and CO2 . About 97 percent of O2 is transported by RBCs in the blood. The remaining 3 percent of O2 is carried in a dissolved state through the plasma. Nearly 20-25 percent of CO2 is transported by RBCs whereas 70 percent of it is carried as bicarbonate. About 7 percent of CO2 is carried in a dissolved state through plasma.
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