4.5 Breathing And Gas Exchange (GCSE Biology)

The following is a GCSE Biology test covering '4.5 Breathing And Gas Exchange'

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Question 1

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What do intercostal muscles do during inhalation?

Which muscle separates the thorax from the abdomen?

What happens to chest volume during expiration (breathing out)?

What process allows oxygen to pass from the alveoli into the bloodstream?

Why is there a rich blood supply surrounding the alveoli?

Why do alveoli have very thin walls?

Which gas diffuses out of the blood into the alveoli?

What happens to the diaphragm when you breathe in?

Which gas is essential for human respiration?

What is the main job of the ventilation system in humans?

Which of the following statements is correct about air breathed out?

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