Q153 / 200 · NEET 2010 (Screening) · Zoology

What is true about RBCs in humans?

  • Correct answer
    A
    They carry about 20-25 per cent of $\mathrm{CO}_2$
  • B
    They transport 99.5 per cent of $\mathrm{O}_2$
  • C
    They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
  • D
    They do not carry $\mathrm{CO}_2$ at all

Solution

Nearly 20-25 per cent of $\mathrm{CO}_2$ is transported by RBCs. It is caused by haemoglobin as carbamino haemoglobin. 70 per cent of $\mathrm{CO}_2$ is carried as bicarbonates. About 97 per cent of $\mathrm{O}_2$ is transported by RBCs in the blood. The remaining 3 per cent of $\mathrm{O}_2$ is carried in dissolved state through the plasma.

Hence, the correct answer is option: 'A'.

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