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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How is carbon dioxide mainly transported in the blood?

How are oxygen molecules transported in the blood?

Which muscle separates the thorax from the abdomen?

Why do alveoli have very thin walls?

What happens to the diaphragm when you breathe in?

What gas makes up the highest percentage in inhaled air?

Which gas diffuses out of the blood into the alveoli?

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

The concentration gradient between alveoli and blood is maintained by:

Which gas is essential for human respiration?

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

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