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