Identify correct statements with respect to CO.
5% of CO2 is dissolved in ___(i)____. Another form in which CO2 is transported is when it combines with hemoglobin and this form is called ___(ii)____hemoglobin. CO2 entering the erythrocytes reacts with water to form carbonic acid in the presence of ____(iii)_____. Carbonic acid is an intermediate step; it dissociates to form a hydrogen ion (H+) from the carbonic acid, leaving___(iv)____ dissolved in the blood.