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

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

In the lungs, a steep concentration gradient helps to:

Gas exchange in lungs takes place across which structures?

What happens to the diaphragm when you breathe in?

Why do alveoli have very thin walls?

Where are human lungs located?

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

What gas makes up the highest percentage in inhaled air?

How is carbon dioxide mainly transported in the blood?

The concentration gradient between alveoli and blood is maintained by:

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