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In an investigation, a person ran at different speeds - Edexcel - GCSE Biology - Question 3 - 2013 - Paper 1

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In an investigation, a person ran at different speeds. The graph shows the concentration of lactic acid in the blood and the heart rate of this person while running... show full transcript

Worked Solution & Example Answer:In an investigation, a person ran at different speeds - Edexcel - GCSE Biology - Question 3 - 2013 - Paper 1

Step 1

Calculate Heart Rate

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Answer

From the graph at a running speed of 22 km h extsuperscript{-1}, the heart rate is approximately 200 beats per minute.

Step 2

Apply Cardiac Output Formula

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Answer

Using the formula for cardiac output:

extcardiacoutput=extstrokevolumeimesextheartrate ext{cardiac output} = ext{stroke volume} imes ext{heart rate}

Substituting the values gives us:

extcardiacoutput=0.18extdm3imes200extbeats/min=36extdm3/extmin ext{cardiac output} = 0.18 ext{ dm}^3 imes 200 ext{ beats/min} = 36 ext{ dm}^3/ ext{min}

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