Carbon dioxide transport

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6 Terms

1
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why and how is carbon dioxide transported?

  • Respiring tissues produce CO2 that needs to be transported to the lungs so it can be exhaled.

2
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carbonic acid

1) CO2 + H2O ←→ H2CO3

catalysed by carbonic anhydrase

reversible so can form and release CO2.

3
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Carbonic acid

Dissociates

H2CO3 ←→ Hydrogencarbonate ions + H+

4
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Chloride shift

whne HCO3- diffuses out, as its a negative ion it causes a charge imbalance so Cl- diffuse in to maintain charge.

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Hydrogen ions

H+ could cause pH to fall so Haemoglobin acts as a buffer and reacts to form haemoglobonic acid

Hb + H+ —> Hhb

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Bohr effect

As partial pressure of CO2 increases, affinity of Oxygen decreases.

As partial pressure of CO2 decreases, affinity of oxygen increases.