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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
Bulk of carbon dioxide $(CO_2)$ released from body tissues into the blood is present as
  • ✓
    bicarbonate in blood plasma and RBCs
  • B
    free $CO_2$ in blood plasma
  • C
    $70\%$ carbamino­haemoglobin and $30\%$ as bicarbonate
  • D
    carbamino­haemoglobin in $RBCs.$
✓

Answer

Correct option: A.
bicarbonate in blood plasma and RBCs
a
(a) : At the tissue site where partial pressure of $CO_2$ is high due to catabolism, $CO_2$ diffuses into blood ($RBCs$ and plasma) and forms $HCO^-$ and $H^+$. At the alveolar site where $pCO_2$ is low, the reaction proceeds in the opposite direction leading to the formation of $CO_2$ and $H_2O$. Thus, $CO_2$ trapped as bicarbonate at the tissue level and transported to the alveoli is released out as $CO_2$.

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