Breathing And Exchange Of Gases Animal Respiration Question 27
Question: The graph shows dissociation curves for four respiratory pigments.
Options:
A) Adult Haemoglobin Haemoglobin with high $ CO_2 $ Foetal Haemoglobin Adult myoglobin 1 2 3 4
B) 2 1 4 3
C) 3 2 1 4
D) 3 4 2 1
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Answer:
Correct Answer: D
Solution:
[d] Myoglobin has the greatest affinity for oxygen and does not unload the oxygen until very low partial pressures of oxygen (below 20 mmHg).
Foetal haemoglobin has a higher affinity for oxygen than adult haemoglobin, thus facilitating the transfer of oxygen from maternal haemoglobin to foetal, haemoglobin at the placenta.
When respiration is occurring at fast rate, more oxygen is needed.
High levels of respiration are associated with high levels of carbon dioxide, hence the affinity of haemoglobin for oxygen decreases at higher carbon dioxide partial pressures so that oxygen can be released to respiring tissues.
BETA
