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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
Approximately seventy percent of carbondioxide absorbed by the blood will be transported to the lungs
  • ✓
    as bicarbonate ions
  • B
    in the form of dissolved gas molecules
  • C
    by binding to $RBC$
  • D
    as carbamino - haemoglobin
✓

Answer

Correct option: A.
as bicarbonate ions
a
$CO_2$ from the respiratory tissues to the lungs is transported by the blood in $3$ ways:
$(i)$ In dissolved state or as a physical solution: Very small amount is physically dissolved in plasma ($7\%$ i.e. $0.3\, ml$ of $CO_2$ by each $100\, ml$ of blood).
$(ii)$ Bicarbonate ions: About $70\%$ (i.e. $@\, 2.5\, ml$ per $100\, ml$ of blood) $CO_2$ diffuses in plasma and then into $RBCs$ where it (in the presence of carbonic anhydrase) combines with $H_2O$ to form carbonic acid which is almost spontaneously dissociated into hydrogen ion and bicarbonate ions.
$(iii)$ Carbaminohaemoglobin : $23\%$ (i.e. $1\, ml$ of $CO_2$ per $100\, ml$ of blood) combines with haemoglobin forming an unstable compound.

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