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Blood transports oxygen from respiratory organs to the tissue cells and also transports carbon dioxide from the tissue cells to the respiratory membrane. About 97% of oxygen is transported by RBCs in the blood while the remaining three percent of oxygen is carried in a dissolved state through plasma. Nearly 20-25% of carbon dioxide is transported by RBCs whereas 70% is carried as bicarbonate. About 7% of CO2 is carried in dissolved state through plasma.

1. Oxygen is transported by RBCs and plasma.
2. Carbon dioxide is mostly transported as bicarbonate.
3. 7% of CO2 is carried in dissolved state through plasma.
4. All of the above.

Correct answer: All of the above.

Solution

The passage states that oxygen is carried mainly by RBCs with a small amount in plasma, and carbon dioxide is transported partly by RBCs, mostly as bicarbonate, and a small fraction dissolved in plasma. Since A, B, and C all agree with the passage, the combined choice is correct.

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