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An investigation was carried out to study the effect of intensity of exercise on metabolic rate - Scottish Highers Biology - Question 9 - 2023
Question 9
An investigation was carried out to study the effect of intensity of exercise on metabolic rate. A calorimeter was used to determine metabolic rate as shown in the ... show full transcript
Worked Solution & Example Answer:An investigation was carried out to study the effect of intensity of exercise on metabolic rate - Scottish Highers Biology - Question 9 - 2023
Step 1
Explain how the design of the calorimeter allowed metabolic rate to be determined.
Answer
The calorimeter's design allows for accurate measurement of the water temperature changes due to metabolic processes. The copper tube has a large surface area, enhancing heat transfer between the water and the body heat produced. Insulation prevents heat loss to the environment, ensuring negligible external interference, which is crucial for determining metabolic rate.
Step 3
Step 4
On the grid, complete the line graph to show the results for running.
Answer
Ensure the axes are correctly labelled with 'Time (minutes)' on the x-axis and 'Temperature increase (°C)' on the y-axis. Plot the points corresponding to the data provided for running (0, 0.4), (5, 0.6), (10, 0.9), (15, 1.0), (20, 1.3), and (30, 1.6) accurately. The line should connect all the points without any discrepancy.
Step 5
Step 6
Draw a conclusion from the results of this investigation.
Answer
The investigation demonstrates that as the intensity of exercise increases, the metabolic rate also increases, evidenced by the higher temperature increases observed in running compared to walking. This indicates a direct correlation between exercise intensity and energy expenditure.