loading, transport and unloading of oxygen Flashcards
(11 cards)
1
Q
What is oxygen combined with in red blood cells?
A
Haemoglobin
2
Q
What type of ion does haemoglobin contain?
A
Iron
3
Q
What does the combination of oxygen and haemoglobin make?
A
Oxyhaemoglobin
4
Q
What does each haemoglobin molecule consist of?
A
Four haem units and four polypeptide chains
5
Q
How many molecules of oxygen does one haemoglobin combine with?
A
Four
6
Q
What type of blood enters the capillaries?
A
Deoxygenated
7
Q
What do the alveoli have a high concentration of?
A
Oxygen
8
Q
What does this create for the diffusion of oxygen?
A
A concentration gradient
9
Q
How is oxygen transported?
A
In the blood
10
Q
What does haemoglobin maintain?
A
A concentration gradient
11
Q
Where does the haemoglobin release oxygen?
A
In respiring tissues
