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Plan it with CORMMSS: Design an investigation (Logic Lab).
2.50 Breathing in humans
Exam question
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Design an investigation to find out how the intensity of exercise affects breathing rate.
(6)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 6 marks
Plan it with CORMMSS: Design an investigation (Logic Lab).
2.50 Breathing in humans
Exam question
Mark points shown after marking
Design an investigation to find out how the duration of exercise affects breathing rate.
(6)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 6 marks
2.50 Breathing in humans
Exam question
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Explain why breathing rate is measured at rest before exercise.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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Explain why the person must rest until their breathing returns to normal between tests.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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Suggest two variables that are hard to control in a human breathing investigation.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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Explain why counting breaths for 15 seconds and multiplying by 4 is less accurate than counting for a full minute.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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Suggest a method other than counting chest rises to measure breathing rate.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
Mark points shown after marking
| Time after exercise / min | Breaths per minute |
|---|---|
| rest | 15 |
| 0 | 34 |
| 2 | 26 |
| 4 | 19 |
| 6 | 16 |
The table shows breathing rate before and after exercise. Describe the results.
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Total for this question: 3 marks
2.50 Breathing in humans
Exam question
Mark points shown after marking
| Time after exercise / min | Breaths per minute |
|---|---|
| −1 (rest) | 15 |
| 0 | 34 |
| 2 | 26 |
| 4 | 19 |
| 6 | 16 |
Plot the breathing rate against time after exercise on the grid (plot rest as time −1). Join your points with straight lines using a ruler.
(5)Graph skills: SLAPUK and choosing a scale
Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 5 marks
2.50 Breathing in humans
Exam question
Mark points shown after marking
| Time after exercise / min | Breaths per minute |
|---|---|
| rest | 15 |
| 0 | 34 |
| 2 | 26 |
| 4 | 19 |
| 6 | 16 |
Using the table, calculate the percentage increase in breathing rate immediately after exercise compared with rest.
(2)Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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Explain why breathing rate does not return to resting rate immediately after exercise.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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A student tested three friends and concluded that exercise always doubles breathing rate. Comment on this conclusion.
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Total for this question: 3 marks
2.50 Breathing in humans
Exam question
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Suggest two safety precautions in an exercise investigation.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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Explain why volunteers should not know when their breathing is being counted.
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Total for this question: 2 marks
2.50 Breathing in humans
Exam question
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In an investigation of step-up speed and breathing rate, identify (i) the independent variable (ii) the dependent variable (iii) one control variable.
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Total for this question: 3 marks
