Gas exchange happens in the alveoli in the lungs - Edexcel - GCSE Biology Combined Science - Question 4 - 2023 - Paper 2
Question 4
Gas exchange happens in the alveoli in the lungs.
Figure 7 shows an alveolus and a capillary.
(a) (i) Name the gas used in respiration that moves from the alveolus... show full transcript
Worked Solution & Example Answer:Gas exchange happens in the alveoli in the lungs - Edexcel - GCSE Biology Combined Science - Question 4 - 2023 - Paper 2
Step 1
Name the gas used in respiration that moves from the alveolus into the capillary.
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Answer
The gas used in respiration that moves from the alveolus into the capillary is oxygen (O₂).
Step 2
Name the gas produced by respiration that moves from the capillary into the alveolus.
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Answer
The gas produced by respiration that moves from the capillary into the alveolus is carbon dioxide (CO₂).
Step 3
Explain how gases move from the alveolus to the capillary.
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Answer
Gases move from the alveolus to the capillary primarily by diffusion. This process occurs down a concentration gradient, where the gas moves from an area of high concentration in the alveolus to an area of low concentration in the capillary. Additionally, this movement takes place through the thin membrane of the alveolar wall, which facilitates the efficient exchange of gases.
