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4.5 Breathing And Gas Exchange (Year 10 Biology)

The following test is covering '4.5 Breathing And Gas Exchange' for Year 10 Biology.
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Question 1
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Which of the following statements is correct about air breathed out?
Each alveolus is shaped to:
Which muscle separates the thorax from the abdomen?
Which gas is essential for human respiration?
Which gas diffuses out of the blood into the alveoli?
Alveoli are clustered together because this:
What happens to chest volume during expiration (breathing out)?