What is true about $RBCs$ in humans?
- AThey carry about $20-25$ per cent of carbon dioxide
- BThey transport $99.5$ per cent of oxygen
- CThey transport about $80$ per cent oxygen only and the rest $20$ per cent of it is transported in dissolved state in blood plasma
- DThey do not carry carbon dioxide at all
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State the different modes of $CO_2$ transport in blood.
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