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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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What do intercostal muscles do during inhalation?
What gas makes up the highest percentage in inhaled air?
Why do alveoli have very thin walls?
Which muscle separates the thorax from the abdomen?
How is carbon dioxide mainly transported in the blood?
What happens to the diaphragm when you breathe in?
What process allows oxygen to pass from the alveoli into the bloodstream?