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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
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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