Breathing in Humans - Practical Skills

Question 1

Outline the procedure to investigate the release of carbon dioxide through breathing

Answer 1

Use a straw to breathe out into a boiling tube containing lime water. Note the change in the lime water

Question 2

What is observed when carbon dioxide is mixed with lime water?

Answer 2

Lime water turns milky

Question 3

Outline the procedure to find the effect of exercise on breathing rate

Answer 3

• Measure the breathing rate (number of breaths per minute) of the participant at rest
• Carry out exercise for a minute
• Measure the breathing rate again and compare