Breathing and Exchange of GasesMedium
Question
The carbon dioxide is transportrd via blood to lungs as
Options
A.dissolved in blood plasma
B.in the form of carbonic acid only
C.in combination with haemoglobin only
D.carbaminohaemoglobin and as carbonic acid
Solution
Most of the CO2 (70%) that dissoves in plasma reacts with water forming carbonig carbonic acid. This reaction occurs rapidly inside RBCs because of the presence of an enzyme car bonic anhydrase. Moreover, above 23% of total blood CO2 is transported by loosely binding with haemoglobin forming an unstable compound called carbaminohaemoglobin
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