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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Gas exchange in lungs takes place across which structures?

Why do alveoli have very thin walls?

In the lungs, a steep concentration gradient helps to:

Where are human lungs located?

How is carbon dioxide mainly transported in the blood?

What is the approximate percentage of carbon dioxide in inhaled air?

Which muscle separates the thorax from the abdomen?

Each alveolus is shaped to:

Which gas diffuses out of the blood into the alveoli?

Which gas is essential for human respiration?

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

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