10: Physiology V

Question 1

Other than as solution, by which two means is CO₂ transported in the blood?

Answer 1

Bicarbonate ions

Carbaminohaemoglobin - i.e CO2 bound to haemoglobin

Question 2

Why is more CO₂ found in solution compared to oxygen?

Answer 2

By Henry’s Law, CO₂ is 20x more soluble than oxygen

Question 3

In which form is most carbon dioxide transported in the blood?

Answer 3

Bicarbonate

Question 4

Which enzyme converts carbon dioxide to bicarbonate?

Answer 4

Carbonic anhydrase

Question 5

Where is carbon dioxide converted into bicarbonate?

Answer 5

Red blood cells

Question 6

By exchange with which ions do bicarbonate ions reach the bloodstream?

Answer 6

Chloride ions

Question 7

Are carbaminohaemoglobin and carboxyhaemoglobin the same compound?

Answer 7

Carbaminohaemoglobin is haemoglobin with CO2 attached; one of the main forms in which carbon dioxide is transported in the blood

Carboxyhaemoglobin is haemoglobin with carbon monoxide attached; increases in smoking and carbon monoxide poisoning