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As level Biology question

Hi, Im stuck on this biology question

A)Describe four adaptations that enable oxygen to be transported rapidly from maternal blood into fetal tissues?

B) Shortly after birth fetal haemoglobin is broken down and replaced by adult haemoglobin. Why is fetal haemoglobin unsuitable for use after birth?

Any help would be appreciated thanks.
Reply 1
Avatar for dh00001
dh00001
16
its all to do with oxygen dissociation. if you have a graph that would help alot.
you need to think of partial pressures and when oxygen disacosiates.
think about activity level in a baby once its outside the womb, if oxygen dissociates too soon only the cells soon after the heart would get oxygen.
hope that helps, but i dont like to give the answers :p::smile:
Reply 2
Avatar for Wangers
Wangers
16
a - think about the differences in the disociation curves of maternal and fetal heamoglobin, feltal heamoglobin is shifted to the left of the normal curve.
b- again think about how much Oxyhaemoglobin would be able to disociate. The baby one out of the womb needs to moderate its own oxygen supply.
Reply 3
Avatar for iainmacn
iainmacn
10
Think I'd also say something about the closeness of the maternal and fetal blood and how this facilitates easy exchange, although I do agree with the stuff already posted too

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