Year 8 - Science
The effects of exercise on breathing and heart rate
Diet and exercise
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers the components of a healthy diet, energy requirements, and the effects of imbalances, exercise, asthma, and smoking on the body. It also focuses on planning scientific enquiries, applying mathematical concepts, performing calculations, and basic data analysis techniques.
Lesson Summary
You will learn to plan and carry out an investigation into the effects of exercise on breathing rate or heart rate.
Key Notes
- Identifying independent variable (amount of exercise) and dependent variable (heart rate or breathing rate).
- Identifying control variables (the person and the length of time spent exercising).
- The independent variable (amount of exercise) is categoric data and goes on the x-axis of a bar chart.
- The dependent variable (heart rate or breathing rate) goes on the y-axis of a bar chart.
- Using knowledge of cellular respiration to explain the results.
Vocabulary To Learn
- dependent variable: The factor that is being measured.
- independent variable: The factor that is being changed.
- breathing rate: The number of breaths per minute.
- heart rate: The number of heart beats per minute.
- control variable: A factor that needs to be kept the same to make the investigation valid.
Common Mistakes To Avoid
- Breathing is the same as respiration.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Identifying independent variable (amount of exercise) and dependent variable (heart rate or breathing rate). Identifying control variables (the person and the length of time spent exercising).
2. Define this scientific word and use it in context. 'dependent variable'
The factor that is being measured. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Breathing is the same as respiration. Correction: Be clear that breathing is the mechanical process to get oxygen in and carbon dioxide out. Whereas, respiration is the chemical process that provides energy for the cell.
More Lessons In This Unit
- Balanced diet Study Guide
- Energy provided by food: practical Study Guide
- Food is a source of building materials and energy Study Guide
- Good and ill health Study Guide
- Imbalanced diet: obesity Study Guide
- Imbalanced diet: starvation and deficiency diseases Study Guide
- Recovery time after exercise Study Guide
- The effects of exercise on the human body Study Guide
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