Figure 2 shows alveoli from a healthy lung - Edexcel - GCSE Biology - Question 2 - 2018 - Paper 1
Question 2
Figure 2 shows alveoli from a healthy lung.
Smoking can cause a condition called emphysema.
Figure 3 shows alveoli from a person with emphysema.
Use words from th... show full transcript
Worked Solution & Example Answer:Figure 2 shows alveoli from a healthy lung - Edexcel - GCSE Biology - Question 2 - 2018 - Paper 1
Step 1
The alveoli from the person with emphysema have a __________ surface area than the alveoli from a healthy lung.
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Answer
smaller
Step 2
The surface area of the alveoli will affect how much oxygen moves into the blood by the process of __________.
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Answer
diffusion
Step 3
Describe the trend shown in Figure 4.
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Answer
As running speed increases, oxygen absorbed increases and then levels off. At around 12 km per hour, it absorbs between 4.1 to 4.2 dm² of oxygen per minute.
Step 4
Which uses more oxygen when the running speed of the athlete changes from 4 to 6 km per hour?
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Answer
A increasing aerobic respiration
Step 5
Explain why the athlete produces lactic acid when running at 14 km per hour.
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Answer
The athlete produces lactic acid due to an increase in anaerobic respiration when the oxygen demand exceeds the supply, especially at high intensities.
