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Homeostasis Investigation Worksheet

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Homeostasis Investigation Worksheet

At a history museum, Cooper, Jarrah and Xavier are studying how the body responds to activity. They use a sample dataset rather than exercising. Read the information, analyse the results and explain how homeostasis is involved. Heart rates are in beats per minute (bpm).

Sample heart-rate results

The students recorded one volunteer’s heart rate before a brisk three-minute walk, immediately after it, and during recovery.

Measurement time

Heart rate (bpm)

Resting, before the walk

Immediately after the walk

132

2 minutes after the walk

4 minutes after the walk

1.In this investigation, what does homeostasis mean? Explain how it relates to keeping internal conditions within a suitable range, rather than keeping every measurement perfectly constant.

2.Use the results table. By how many beats per minute did the volunteer’s heart rate rise from rest to immediately after the walk?

3.Which statement best describes the pattern in the data?

Heart rate rose after activity and then moved back towards the resting rate.
Heart rate stayed at the resting rate throughout.
Heart rate fell after activity and continued falling.
Heart rate rose steadily throughout the recovery period.

4.The working muscles need more oxygen and release more carbon dioxide during activity. Explain why the heart rate increases during the walk.

5.After the walk, the heart rate moves towards its resting level. Is this an example of negative feedback? Explain your choice.

6.Complete the simplified response pathway: activity changes the body’s needs → receptors detect relevant changes → the cardiovascular control centre in the brain processes information → effectors adjust heart activity. Name one type of receptor that can provide information relevant to this response.

7.At four minutes, the heart rate is 78 bpm, still 6 bpm above the resting value. Give one sensible reason it may not have returned exactly to its starting value yet.

8.Evaluate the investigation: name one factor the students should keep the same and one improvement that would make their results more reliable.

9.The sample results show one volunteer’s response. Can the students conclude that every Year 9 student will have exactly the same heart-rate pattern? Give a reason.

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About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

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