The table below shows pulse rate measured from the radial artery of one student before, during and after a steady cycling test. The student counted each pul...
Question 1 Report
The table below shows pulse rate measured from the radial artery of one student before, during and after a steady cycling test. The student counted each pulse for 30 seconds and doubled the result.
| Time relative to cycling | Pulse rate / beats per minute |
|---|---|
| Before cycling | 68 |
| After 4 minutes cycling | 142 |
| 2 minutes after cycling | 104 |
| 6 minutes after cycling | 76 |
(a) State the student’s pulse rate after 4 minutes of cycling. [1]
(b) Calculate the increase in pulse rate between before cycling and after 4 minutes cycling. Show your working. [2]
(c) Explain why the heart rate increased during cycling. [2]
(d) Describe one way the student could improve the reliability of these results. [1]
Answer Details
(a) After 4 minutes of cycling, the pulse rate is 142 beats per minute. [1]
(b)
\[142-68=74\text{ beats per minute}\]
The pulse-rate increase is 74 beats per minute. [2]
(c) During cycling, muscle cells respire faster and need more energy. The heart rate rises so blood can deliver more oxygen and glucose for respiration, as well as remove more carbon dioxide. [2]
(d) Improve reliability by repeating measurements and calculating a mean. Using several students and calculating a mean is also acceptable. [1]
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