QuestionSBA
QuestionChoice
The curve shifts to the right (rightward shift) to reflect the decreased affinity of Hb for O<sub>2</sub> due to CO<sub>2</sub> now taking up more of the Hb binding sites.
10000603
c
No change in position or shape of the curve
QuestionChoice
This would indicate the Hb having an increased affinity for O<sub>2</sub>, and as the Hb binding sites are taken up by CO<sub>2</sub> due to the increased CO<sub>2</sub> concentration, it instead has a decreased affinity and so shifts to the right.
10000602
b
Leftward shift
QuestionChoice
Only rightward or leftward shifts are seen in oxygen-haemoglobin dissociation curves, specifically a rightward shift when CO<sub>2</sub> is increased.
10000605
e
Downward shift
QuestionChoice
A hyperbolic (AKA exponential) curve is seen in myoglobin (Mb), not haemoglobin (Hb).
10000604
d
The curve becomes hyperbolic in shape rather than S-shaped
QuestionChoice
Increased CO<sub>2</sub> in the blood causes a decreased affinity of Hb for O<sub>2</sub> which then leads to the oxygen-Hb dissociation curve shifting to the right, as the Hb is less saturated with O<sub>2</sub>.
10000601
a
Rightward shift
Concept
Chapter
2693
3797
Haemoglobin
Topic
157
Haematology
12667
Which of the following best describes the effect of increased blood CO<sub>2</sub> on the oxygen-haemoglobin (Hb) dissociation curve?
a