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Respiration and Gas Exchange
Quick questions on Gas exchange in the alveoli: N(A)-Level Biology Respiration and Gas Exchange
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is oxygen into the blood?Show answer
The air breathed into an alveolus has a high concentration of oxygen. The blood arriving in the capillary has a low concentration of oxygen (it has been used up by the body cells). So oxygen diffuses down the gradient, from the alveolus across the thin walls into the blood. The blood then carries the oxygen to the body cells.
What is carbon dioxide out of the blood?Show answer
The blood arriving at the alveolus has a high concentration of carbon dioxide, made by the body cells during respiration. The air in the alveolus has less. So carbon dioxide diffuses the other way, out of the blood into the alveolus, and is then breathed out.
What is q1?Show answer
Name the process by which oxygen moves from the alveolus into the blood. [1 mark]
What is q2?Show answer
State the direction carbon dioxide moves during gas exchange. [1 mark]
What is q3?Show answer
Explain how the large surface area of the alveoli helps gas exchange. [2 marks]
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