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A-Level Biology OCR A

Ions Rbc Diffuse Describe  To Leave Lungs Formation

In the lungs, haemoglobinic acid dissociates, and bicarbonate ions re-enter red blood cells to form carbonic acid, which breaks down into CO2 and water. CO2 then diffuses out of red blood cells and into the lungs.

En los pulmones, el ácido hemoglobínico se disocia, y los iones bicarbonato vuelven a los glóbulos rojos para formar ácido carbónico, que se descompone en CO2 y agua. El CO2 difunde fuera de los glóbulos rojos y hacia los pulmones.

Front Describe what causes CO2 to leave RBC at the lungs.
Back Formation of CO2 gas at the lungs:
  • Haemoglobinic acid dissociates into H+ and Hb
  • Hydrogencarbonate ions diffuse back into RBC and react with hydrogen ions to form carbonic acid, chloride ions diffuse out
  • This is broken down to release free CO2 (carbonic anhydrase) that diffuses out of blood into lungs down a concentration gradient

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