When an athlete began running both her breathing and heart rates increased. the athlete’s breathing and heart rates increased as she was running because the athlete needed to:

Hey!

The heart rate INCREASED beacuse the Athlete needed to take in more oxygen...

The breathing rate INCREASED to get rid of Carbon Dioxide...

Explanation:

CO2--poisonous for cells in the Human body...breathing it can kill AND the CO2 is produced MORE as she execises as respiration happened quicker...

Oxygen---more oxygen presence aides the rates of respirartion and reduces the chance of OXYGEN DEBT = The lack of oxygen can lead to damage to muscles as LACTIC ACID is produced (poisonous for muscle cells)

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