What is true about RBCs in humans?

MCQ

What is true about $RBCs$ in humans?

✓
They carry about $20-25$ percent of $CO_2.$
B
They transport $99.5 $ percent of $O_2.$
C
They transport about $80$ percent oxygen only and the rest $20$ percent of it is transported in dissolved state in blood plasma.
D
They do not carry $CO_2$ at all.

✓

Answer

Correct option: A.

They carry about $20-25$ percent of $CO_2.$

a
(a) : Blood is the medium of transport for $O_2$ and $CO_2$. About $97$ percent of $O_2$ is transported by $RBCs$ in the blood. The remaining $3 $ percent of $O_2$ is carried in a dissolved state through the plasma. Nearly $20-25$ percent of $CO_2$ is transported by $RBCs$ whereas $70$ percent of it is carried as bicarbonate. About $7$ percent of $CO_2$ is carried in a dissolved state throughplasma.

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