Haemoglobin Flashcards
(8 cards)
1
Q
Structure of haemoglobin
A
Protein made of 4 polypeptide chains each associated with a haem group
2
Q
How many oxygens can be carried?
A
4
One by each haem group
3
Q
What does it carry and form
A
haemoglobin carries oxygen/ has a high affinity for oxygen = form ozyhaemoglobin
4
Q
In which cells
A
Red blood cells
5
Q
Where does unloading occur
A
Lungs at high partial pressure
6
Q
Where does unloading occur
A
Respiring tissues at low partial pressure of oxygen
7
Q
How is unloading linked to co2 levels
A
Higher co2 concentration = unloading
8
Q
Reason for s shaped sigmoid dissociation curve
A
1 first oxygen binds to haemoglobin causing change in shape
2 shape change allows more o2 to bind easily and increase saturation quickly
3 at end all is saturated and so curve levels off
