3. Organisms Exchange Substances - Haemoglobin Flashcards
(6 cards)
1
Q
Describe the structure of a haemoglobin molecule:
A
- Quaternary structure
- 4 polypeptide chains
- 2 alpha and 2 beta polypeptide chains
- A haem group on each polypeptide, which contains a Fe2+ ion
2
Q
How many oxygen molecules can be carried by a single haemoglobin molecule in humans?
A
4 O2 molecules.
3
Q
What is the process by which haemoglobin binds with oxygen?
A
Loading/associating
4
Q
What is the process by which haemoglobin releases its oxygen?
A
Unloading/dissociating
5
Q
Where does haemoglobin associate with oxygen?
A
At the site of gas exchange.
6
Q
Where does haemoglobin dissociate from oxygen?
A
At the tissues requiring it.
