Exercise and Your Body's Response

Year 8 Science Understanding how our bodies adapt to physical activity

What is Respiration?

A chemical reaction that happens in every cell Releases energy from glucose using oxygen Essential for all life processes Formula: Glucose + Oxygen → Energy + Carbon dioxide + Water

Quick Think!

What happens to your breathing when you run up stairs? Why do you think this happens?

Your Body During Exercise

Heart rate increases to pump more blood Breathing rate increases to take in more oxygen Blood carries oxygen to working muscles Muscles need extra energy for movement

Before vs After Exercise

{"left":"Resting heart rate: 60-100 beats per minute\nExercising heart rate: 120-180 beats per minute","right":"Resting breathing: 12-20 breaths per minute\nExercising breathing: 30-60 breaths per minute"}

Let's Investigate!

Work in pairs Measure resting heart rate and breathing rate Do 2 minutes of exercise Measure rates immediately after exercise Record your results

Investigation Variables

Analyzing Our Data

Calculate average rates before and after Look for patterns in the class results Compare your results with others Think about why rates increased

The Science Connection

During exercise, your muscles need MORE ENERGY. To get this energy, cells need MORE OXYGEN. Your heart and lungs work harder to deliver this oxygen through increased heart rate and breathing rate.

Exit Ticket Assessment

Write one sentence explaining: Why do heart and breathing rates increase after exercise? Include the words: oxygen, energy, and cells