Carriage of carbon dioxide

HideShow resource information

3 ways that carbon dioxide is transported back to the lungs:

  • 5% is dissolved in the blood plasma as CO2.
  • 10% is transported as carbinohaemoglobin (haemoglobin combined with carbon dioxide)
  • 85% as hydrogencarbonate ions 

FORMING HYDROGENCARBONATE IONS

1. carbon dioxide diffuses into the blood, some will diffuse into a red blood cell.

2. in the erythrocyte CO2 combines with H2O forming carbonic acid, H2CO3, under the influence of the carbonic andydrase catalyst.

3. the H2CO3 then dissociates, releasing H+ ions ans CO3- (hydrogencarbonate ions), the hydrogencarbonate ions diffuse out of the red blood cell into the blood plasma.

4. chloride ions, Cl-, diffuse into the red blood cell to balance the charge in a process called the chloride shift.

5. to stop the RBC becoming acidic the hydrogen ions are taken up by haemoglobin, Hb, forming haemoglobinic acid, HHb. In

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Exchange and transport resources »