Question
In blood, CO2 is transported majorly as
sodium carbonate
carboxyhaemoglobin
bicarbonate
CO2 as such
Solution
C.
bicarbonate
In dissolved state 7% of CO2 gets dissolved in the blood plasma and about 0.3 mL of CO2 is transported per 100 mL of blood in plasma.
In the form of bicarbonate about 70% of CO2 is received by blood from tissues, enters the RBCs where it reacts with water to form carbonic acid (H2CO3).
As carbaminohaemoglobin about 23% of CO2 is transported in combination with haemoglobin and plasma proteins. CO2 reacts with NH2 (amine radicals) of Hb to form an unstable compound cabamino- haemoglobin (Hb.CO2).
Sodium bicarbonate acts as a buffer of blood.
