Topic 4 - Investigating Breathing

Question 1

how could you investigate your breathing rate when you exercise?

Answer 1

1. sit still for five minutes, then count your breaths for 1 minute
2. do four minutes of exercise and count your breaths for 1 minute as soon as you stop
3. repeat and find a mean

Question 2

how could you investigate the release of carbon dioxide in your breath?

Answer 2

1. set up 2 boiling tubes attached to a mouthpiece with one end in the limewater of tube A and one end not in the limewater of tube B
2. breathe into the mouthpiece
3. as you breath out, your exhaled air bubbles through the limewater in tube A, turning the limewater cloudy. the limewater in tube B remains clear