IGCSEBiologyCIERevision Notes9. Transport in Animals9.1 Circulatory Systems, Heart & Blood Vessels9.1.9 Explaining the Effect of Physical Activity on Heart Rate: Extended

Explaining the Effect of Physical Activity on Heart Rate: Extended (CIE IGCSE Biology)

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Explaining the Effect of Physical Activity on Heart Rate: Extended

  • So that sufficient blood is taken to the working muscles to provide them with enough nutrients and oxygen for increased respiration
  • An increase in heart rate also allows for waste products to be removed at a faster rate
  • Following exercise, the heart continues to beat faster for a while to ensure that all excess waste products are removed from muscle cells
  • It is also likely that muscle cells have been respiring anaerobically during exercise and so have built up an oxygen debt
  • This needs to be ‘repaid’ following exercise and so the heart continues to beat faster to ensure that extra oxygen is still being delivered to muscle cells
  • The extra oxygen is used to break down the lactic acid that has been built up in cells as a result of anaerobic respiration

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    Lára

    Author: Lára

    Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.