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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. (a) The graph shows the concentration of lactic acid in the blood and the heart rate of this person while run... 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 the Heart Rate

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Answer

From the graph, at a running speed of 22 km h<sup>-1</sup>, the heart rate is approximately 200 beats per minute.

Step 2

Use the Cardiac Output Formula

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Answer

Using the formula: cardiac output=stroke volume×heart rate\text{cardiac output} = \text{stroke volume} \times \text{heart rate} we have:

  • Stroke volume = 0.18 dm<sup>3</sup>
  • Heart rate = 200 beats per minute So, substituting these values into the equation gives: cardiac output=0.18 dm3×200 beats/min\text{cardiac output} = 0.18 \text{ dm}^3 \times 200 \text{ beats/min}

Step 3

Calculate Cardiac Output

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Answer

Performing the multiplication: cardiac output=36 dm3/extmin\text{cardiac output} = 36 \text{ dm}^3 / ext{min} Thus, the cardiac output of the runner is 36 dm<sup>3</sup> per minute.

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