Bulk of carbon dioxide $\left(\mathrm{CO}_2\right)$ released from body tissues into the blood is present as

Bulk of carbon dioxide $\left(\mathrm{CO}_2\right)$ released from body tissues into the blood is present as
  1. bicarbonate in blood plasma and RBCs
  2. free $\mathrm{CO}_2$ in blood plasma
  3. $70 \%$ carbamino-haemoglobin and $30 \%$ as bicarbonate
  4. carbamino-haemoglobin in RBCs

Solution

$70-75 \%$ of $\mathrm{CO}_2$ is transported as sodium bicarbonate $\left(\mathrm{NaHCO}_3\right)$ by plasma, and as potassium bicarbonate $\left(\mathrm{KHCO}_3\right)$ by RBCs.

Asked in: NEET 2011 (Mains)

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