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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 at 22 km h⁻¹

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Answer

From the graph, the heart rate corresponding to a running speed of 22 km h⁻¹ is around 198 to 200 beats per minute. For calculation, we can use an average heart rate of 199 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} Substituting the values:

cardiac output=0.18 dm3×199 beats/min\text{cardiac output} = 0.18 \text{ dm}^3 \times 199 \text{ beats/min}

Step 3

Calculate the cardiac output

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Answer

Calculating the above expression gives:

cardiac output=35.82 dm3/min\text{cardiac output} = 35.82 \text{ dm}^3/\text{min} Rounding off, the cardiac output is approximately 36 dm³ per minute.

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