HOME-WORK 2: GAS EXCHANGE TOPIC
MCQ: choose the right answer
1) The diagram below shows a cross-section through an alveolus and capillary.
Why does oxygen move from P to Q?
A. The concentration of carbon dioxide is lower in the alveolus than in the blood.
B. The concentration of oxygen in the blood is higher than in the oxygen in the alveolus.
C. Oxygen must replace carbon dioxide.
D. The concentration of oxygen in the blood is lower than the oxygen in the air/alveolus.
2) What helps oxygen to be absorbed rapidly into the blood in the lungs?
A Air breathed in has less oxygen than air breathed out.
B Alveoli have thick walls and a large surface area.
C Alveoli have thin walls and a large surface area.
D The concentration of oxygen in the blood is higher than in the alveoli.
3) Which route is taken by air passing into the lungs of a human?
A alveolus → trachea → bronchus
B bronchus → trachea → alveolus
C trachea → alveolus → bronchus
D trachea → bronchus → alveolus
Short Answer Question: List down 4 features of the lungs that make gas exchange efficient
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