Oxygen Dissociation Curves (AQA A-Level Biology): Flashcards
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Oxygen dissociation curve shows
Oxygen dissociation curve shows
% Hb saturation vs partial pressure
Shape of oxygen dissociation curve
Shape of oxygen dissociation curve
S-shaped (sigmoid)
Cause of S-shaped curve
Cause of S-shaped curve
Positive cooperativity
Why initial binding to Hb is difficult
Why initial binding to Hb is difficult
4 polypeptide subunits tightly packed in quaternary structure
Positive cooperativity
Positive cooperativity
1st binding makes subsequent binding easier
Why curve flattens after 3rd binds
Why curve flattens after 3rd binds
Fewer available sites due to probability
Left-shifted curve meaning
Left-shifted curve meaning
Higher affinity for oxygen
Right-shifted curve meaning
Right-shifted curve meaning
Lower affinity for oxygen
Left-shifted curve loading trait
Left-shifted curve loading trait
Loads readily at lower partial pressures
Right-shifted curve unloading trait
Right-shifted curve unloading trait
Oxygen unloads more readily