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IGCSEBiologyCambridge (CIE)Revision Notes9. Transport in AnimalsCirculatory Systems, Heart & Blood VesselsExplaining the Effect of Physical Activity on Heart Rate

Explaining the Effect of Physical Activity on Heart Rate (Cambridge (CIE) IGCSE Biology) : Revision Note

Lára Marie McIvor

Written by: Lára Marie McIvor

Reviewed by: Lucy Kirkham

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Explaining the Effect of Physical Activity on Heart Rate: Extended

Extended Tier Only

  • Heart rate increases during exercise to increase blood flow to the working muscles

  • This is important for several reasons:

    • To provide them with enough nutrients and oxygen for increased respiration

    • To remove waste products 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

    • to deliver extra oxygen to the muscle cells to pay off the oxygen debt accumulated when oxygen levels are not high enough to support aerobic respiration

      • 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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    Author
    Reviewer
    Lára Marie McIvor

    Author: Lára Marie McIvor

    Expertise: Biology Lead

    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.

    Lucy Kirkham

    Reviewer: Lucy Kirkham

    Expertise: Head of STEM

    Lucy has been a passionate Maths teacher for over 12 years, teaching maths across the UK and abroad helping to engage, interest and develop confidence in the subject at all levels.Working as a Head of Department and then Director of Maths, Lucy has advised schools and academy trusts in both Scotland and the East Midlands, where her role was to support and coach teachers to improve Maths teaching for all.