Pupil sheet · Exercise and heart health
Exercise and heart health — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. identify
A doctor wants to check whether the valves of a patient's heart close properly. Which method should she use?
Circle one answer.
- recording an ECG from the chest
- listening through a stethoscope
- counting the pulse at the wrist
- measuring the blood pressure
2. calculate
A heart-rate sensor shows a steady 96 beats per minute. At the same time a pupil counts the pulse for 15 seconds and gets 20 beats. Calculate the count he should have got, and how many beats he missed.
Count he should have got: ______________ unit ________
Beats missed: ______________ unit ________
3. calculate
A heart monitor shows a steady heart rate of 100 beats per minute. Calculate the time between two tall spikes on the ECG trace.
Time between two tall spikes: ______________ unit ________
4. identify
A swimmer's heart rate is measured before a hard 200 m swim, at the end of it, and 1 minute and 8 minutes after it. Which row shows the most likely readings, in beats per minute?
| Row | Before the swim | End of the swim | 1 minute after | 8 minutes after |
|---|---|---|---|---|
| A | 62 | 146 | 146 | 146 |
| B | 62 | 146 | 62 | 62 |
| C | 62 | 146 | 118 | 62 |
| D | 62 | 98 | 124 | 62 |
Circle one answer.
- A
- B
- C
- D
5. identify
A pupil investigates whether the height of the step changes the recovery time in a step test. Which row is correct for a fair test?
| Row | Changed on purpose | Measured | Kept the same |
|---|---|---|---|
| A | step height | recovery time | stepping rate and time spent stepping |
| B | recovery time | step height | stepping rate and time spent stepping |
| C | step height | stepping rate | recovery time and time spent stepping |
| D | stepping rate | recovery time | step height and time spent stepping |
Circle one answer.
- A
- B
- C
- D
6. predict
Supplement. Two pupils of the same fitness exercise for 5 minutes. A jogs gently. B runs as fast as he can, and his muscles make lactic acid. Predict whose heart rate stays raised for longer afterwards, and why.
Circle one answer.
- B's stays raised longer, because his blood must take lactic acid to the liver.
- Both recover in the same time, because they exercised for the same 5 minutes.
- B's falls sooner, because the lactic acid makes his heart muscle relax and slow.
- A's stays raised for longer, because aerobic respiration makes more carbon dioxide.
7. identify
For years a fatty deposit has narrowed one of Mrs Tan's coronary arteries, and she has felt well at rest. One evening, while she sits reading, she has a heart attack. Which row describes what happened in the artery that evening?
| Row | What closed the channel | How long it took to close | Blood reaching the heart muscle beyond |
|---|---|---|---|
| A | the fatty deposit grew larger | a few minutes | none |
| B | a blood clot formed on the deposit | a few minutes | enough while she rests |
| C | a blood clot formed on the deposit | a few minutes | none |
| D | a blood clot formed on the deposit | several years | none |
Circle one answer.
- A
- B
- C
- D
8. calculate
In a ten-year study, 15 of 500 non-smokers and 40 of 500 smokers developed coronary heart disease. Calculate the percentage of smokers who developed it. Then calculate how many times as likely the smokers were to develop it as the non-smokers.
Smokers who developed coronary heart disease: ______________ unit ________
Times as likely: ______________ unit ________
9. predict
An adult takes in 11 500 kJ of energy from food each day but uses only 10 000 kJ. Predict the effect over many months, and how it changes his risk of coronary heart disease.
Circle one answer.
- His body mass stays the same, because his heart uses up the extra energy.
- His body mass rises, and obesity raises his blood pressure and his risk.
- His body mass stays the same, because the extra energy passes out as waste.
- His body mass rises, but only the saturated fat he eats can change his risk.