Which part of the breathing system is represented by the glass tube?
Tick (✓) one box - AQA - GCSE Biology - Question 6 - 2021 - Paper 1
Question 6
Which part of the breathing system is represented by the glass tube?
Tick (✓) one box.
Alveoli
Capillaries
Lung
Trachea
Give two reasons why the teacher is correct... show full transcript
Worked Solution & Example Answer:Which part of the breathing system is represented by the glass tube?
Tick (✓) one box - AQA - GCSE Biology - Question 6 - 2021 - Paper 1
Step 1
Which part of the breathing system is represented by the glass tube?
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Answer
The part of the breathing system represented by the glass tube is the trachea. This is the correct option as it is a flexible tube that carries air to and from the lungs.
Step 2
Give two reasons why the teacher is correct.
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Answer
The glass tube is similar to the trachea in that it allows air to flow without obstruction.
Unlike alveoli or capillaries, which are involved with gas exchange, the trachea primarily serves as a passage for air.
Step 3
Give two variables the scientist controlled in the investigation.
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Answer
The speed of the treadmill on which the subjects were running.
The type of exercise that was performed.
Step 4
Calculate the percentage increase in the man’s breathing rate between 0 minutes and 8 minutes.
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Answer
To calculate the percentage increase, we use the formula:
extpercentageincrease=(breathing rate at 0 minutesbreathing rate at 8 minutes−breathing rate at 0 minutes)×100
Substituting in the values:
breathing rate at 8 minutes=42, breathing rate at 0 minutes=20
Explain why the man's breathing rate increased when he was running.
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Answer
The man's breathing rate increased while running because physical activity requires more oxygen to be delivered to the muscles. As the body works harder, it produces more carbon dioxide, thus the respiratory system must increase the breathing rate to expel the excess CO2 and meet the oxygen demand.
Step 6
Give one measurement that could be taken to show a different effect of exercise on the body.
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Answer
One measurement that could be taken is the heart rate or pulse rate during exercise. This will help to indicate how hard the heart is working to pump blood and deliver oxygen to muscles.
Step 7
Give one effect that smoking can have on the body.
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Answer
One effect of smoking on the body is an increased risk of lung cancer. Smoking damages the lungs and can lead to severe respiratory diseases.
