Haemoglobin

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  • Created by: Alice
  • Created on: 27-05-14 23:39
What is the role of Haemoglobin?
To transport oxygen
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For efficiency, haemoglobin must do two things. What are they?
It must readily associate with oxygen at the surface where gas exchange takes place. It must readily dissociate from oxygen at tissues requiring it
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What happens to haemoglobin in the presence of co2?
Changes shape so it binds to oxygen more loosely and releases it easily
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Describe what happens at the gas exchange surface in terms of Haemoglobin
High oxygen concentration, low carbon dioxide concentration, high haemoglobin affinity for oxygen, oxygen loads
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Describe what happens at the respiring tissues in terms of Haemoglobin?
Low oxygen concentration, high carbon dioxide concentration, low haemoglobin affinity for oxygen, oxygen released
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What do haemoglobins with a high affinity for oxygen do?
Take oxygen up more easily, release it less readily
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What do haemoglobins with a low affinity for oxygen do?
Take oxygen up less easily, release it more readily
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What do we say about haemoglobin and a person's environmental factors?
There is a correlation between haemoglobin type and environmental factors
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What do organisms living in a high altitude climate need?
Need haemoglobin with high affinity for oxygen so their haemoglobin combines easily with oxygen as they have little oxygen in their respective environment.
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What do organisms with a high metabolic rate need?
Need haemoglobin with low affinity for oxygen so oxygen is readily released to the respiring tissues. Energy is being used up so need more oxygen for respiration
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What is loading?
Haemoglobin combines and associates with oxygen in the lungs
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What is unloading?
Haemoglobin releases and dissociates from oxygen at the respiring tissues
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What is the structure of Haemoglobin?
1st Structure - four PP chains of amino acids. 2nd - each chain coiled - helix. 3rd - Each PP folded into a precise shape to allow the carrying of oxygen. 4th - 4 PP chains linked with haem groups with ferrous ion, FE2+, to carry oxygen
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How are Haemoglobin molecules different?
Different affinities for oxygen - different sequences of amino acids and different shapes
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Other cards in this set

Card 2

Front

For efficiency, haemoglobin must do two things. What are they?

Back

It must readily associate with oxygen at the surface where gas exchange takes place. It must readily dissociate from oxygen at tissues requiring it

Card 3

Front

What happens to haemoglobin in the presence of co2?

Back

Preview of the front of card 3

Card 4

Front

Describe what happens at the gas exchange surface in terms of Haemoglobin

Back

Preview of the front of card 4

Card 5

Front

Describe what happens at the respiring tissues in terms of Haemoglobin?

Back

Preview of the front of card 5
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