L6 - Carriage of oxygen

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Last updated 7:55 PM on 4/11/26
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9 Terms

1
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Features of Haemoglobin

  • 4 Haem subunits

  • Each carry one O2 molecule each

    • 8O atoms total

2
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What is positive cooperation?

When first O2 molecule bins, Hb changes shape to make it easier for the next ones to bind.

3
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What shape is the oxygen dissociation curve?

Sigmoidal - s - shape

4
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Which direction would the oxygen diss. curve be shifted in smaller mammals?

To the right - they lose body heat easier.

Shifted right allows O2 to be dissociated even at higher pO2 to maintain metabolic rate

5
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What does myoglobin do?

Stores O2 and delivers it to mitochondria instead of transporting it.

Releases O2 when muscle tissues increase in activity

6
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Features of myoglobin?

Higher affinity for haemoglobin so only releases when muscle supplies are low.

Released to delay onset of anaerobic respiration.

7
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Meaning of Affinity for O2

The strength of which Hb binds to oxygen

  • determines how strongly it associates with O2 in lungs and dissociates in muscle tissue.

8
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Features of fetal haemoglobin

Higher affinity for O2

  • allows more O2 to be gained than adult Hb

9
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Why does the Fetal blood stream run close to the Mothers blood stream?

Oxygenated blood from mother runs close to Fetal deoxygenated blood

  • Oxygen diffuses into fetal blood stream

    • Acts as a functional lung for fetus