A-LEVEL BIOLOGY AQA NOTES 
mass transport in animals

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Mass Transport in Animals
  • Red blood cells transport oxygen using the protein haemoglobin
  • Haemoglobin is made up of four polypeptide chains, each containing a prosthetic haem group. Each haem group binds one oxygen molecule
  • Binding of the first O2 molecule causes a conformational change in the haemoglobin, making the haem groups more accessible to oxygen.
  • Bohr affect- haemoglobin’s oxygen binding affinity is inversely related to the concentration of carbon dioxide, causing the oxygen dissociation curve to shift
  • ​The cardiac cycle is the sequence of events that occur within one full beat of the heart.
  • Circulatory system: