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Two students, X and Y, investigated how exercise affected breathing rate - Edexcel - GCSE Biology - Question 2 - 2014 - Paper 1
Question 2
Two students, X and Y, investigated how exercise affected breathing rate. They recorded their breathing rate at rest. Their breathing rate was then measured each m... show full transcript
Worked Solution & Example Answer:Two students, X and Y, investigated how exercise affected breathing rate - Edexcel - GCSE Biology - Question 2 - 2014 - Paper 1
Step 1
Calculate the increase in the breathing rate of student Y from rest to 5 minutes of exercise.
Answer
To determine the increase in the breathing rate of student Y, we subtract the initial rate at rest (12 breaths per minute) from the rate at 5 minutes of exercise (35 breaths per minute).
This can be calculated as follows:
Thus, the increase in the breathing rate of student Y is 23 breaths per minute.
Step 2
Suggest a reason for the difference in the overall increase in the breathing rate between students X and Y.
Answer
One possible explanation for the difference in the overall increase in breathing rate between students X and Y could be that:
- Student Y may have been exercising harder or faster than student X, leading to a greater demand for oxygen, hence a higher increase in breathing rate.
- Alternatively, student Y might have a smaller lung capacity, greater mass, or started off with a higher breathing rate, contributing to the observed differences.