Question

State whether the following statements are true(T) or false(F):

(iv) CO2 is transported to the lungs by the blood in two forms: as bicarbonates and as carbamino-haemoglobin. T/F

Answer 1

The statement is ‘True (T)’.

CO2 molecules are transported in the blood from body tissues by following three methods:

1. Dissolve directly into the blood plasma (5-7%)

2. Binding to the haemoglobin molecule (10%).

3. When carbon dioxide binds to haemoglobin, a molecule called carbamino-haemoglobin is formed.

4. ${CO}_2$ + Haemoglobin → Carbamino haemoglobin Carried as a bicarbonate ion (85%).

${CO}_2$+$H_{2}O$ ⟷ $H_2$${CO}_3$ ⟷ ${HCO}_3^{-}$ + $H^{+}$ (carbonicacid) (bicarbonate)