| The graph shows an oxygen dissociation curve for haemoglobin. |
 |
| In the body at which point, haemoglobin will be saturated at the percentages shown at points 1, |
| 2, and 3 on the graph? |
A)
Left ventricle Pulmonary vein Vena cava 1 2 3
B)
Left ventricle Pulmonary vein Vena cava 2 1 3
C)
Left ventricle Pulmonary vein Vena cava 2 3 1
D)
Left ventricle Pulmonary vein Vena cava 3 2 1
Correct Answer: C
Solution :
The blood in the vena cava would have the least percentage saturation since it has released the oxygen to respiring body tissues. The pulmonary vein would contain blood with the highest percentage saturation since it carries blood from the lungs, where the partial pressure of oxygen is very high and oxygen binds with the haemoglobin. The pulmonary vein leads to the left atrium and then the left ventricle, hence the percentage saturation here would be slightly lower as some oxygen would have been released along the way.
You need to login to perform this action.
You will be redirected in
3 sec
