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When the running speed is 22 km h<sup>-1</sup>, the stroke volume of the runner is 0.18 dm<sup>3</sup> - Edexcel - GCSE Biology - Question 3 - 2013 - Paper 1

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When the running speed is 22 km h<sup>-1</sup>, the stroke volume of the runner is 0.18 dm<sup>3</sup>. Calculate the cardiac output of the runner using the equation... show full transcript

Worked Solution & Example Answer:When the running speed is 22 km h<sup>-1</sup>, the stroke volume of the runner is 0.18 dm<sup>3</sup> - Edexcel - GCSE Biology - Question 3 - 2013 - Paper 1

Step 1

Calculate the heart rate

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Answer

From the graph, at a running speed of 22 km/h, the heart rate is 200 beats per minute.

Step 2

Use the cardiac output formula

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Answer

Using the formula provided:

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

Substituting the values:

extcardiacoutput=0.18extdm3imes200extbeatsperminute ext{cardiac output} = 0.18 ext{ dm}^3 imes 200 ext{ beats per minute}

Step 3

Perform the calculation

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Answer

Thus:

extcardiacoutput=0.18imes200=36extdm3extperminute ext{cardiac output} = 0.18 imes 200 = 36 ext{ dm}^3 ext{ per minute}

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