Oxygen Dissociation Curves (AQA A-Level Biology): Quizzes
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10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does an oxygen dissociation curve show?
What does an oxygen dissociation curve show?
Haemoglobin saturation vs oxygen partial pressure
What is the characteristic shape of an oxygen dissociation curve?
What is the characteristic shape of an oxygen dissociation curve?
S-shaped (sigmoid)
Why is the first oxygen molecule difficult to bind to haemoglobin?
Why is the first oxygen molecule difficult to bind to haemoglobin?
Tight quaternary structure restricts access
What is positive cooperativity in haemoglobin?
What is positive cooperativity in haemoglobin?
First oxygen binding aids subsequent binding
Why is the middle section of the curve steep?
Why is the middle section of the curve steep?
Positive cooperativity increases binding
Why does the curve plateau after the third oxygen binds?
Why does the curve plateau after the third oxygen binds?
Fewer available sites remain
What does a left-shifted curve indicate?
What does a left-shifted curve indicate?
Higher oxygen affinity
What characterises a right-shifted curve?
What characterises a right-shifted curve?
Oxygen unloads more readily
Where does haemoglobin pick up oxygen most efficiently?
Where does haemoglobin pick up oxygen most efficiently?
In lungs (high partial pressure)
How do people adapt to high altitude?
How do people adapt to high altitude?
Haemoglobin becomes more efficient at oxygen capture