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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Alveoli are clustered together because this:

Which gas is essential for human respiration?

In the lungs, a steep concentration gradient helps to:

How are oxygen molecules transported in the blood?

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

Which muscle separates the thorax from the abdomen?

Which gas diffuses out of the blood into the alveoli?

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

What do intercostal muscles do during inhalation?

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

Why is there a rich blood supply surrounding the alveoli?

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