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Define ventilation

Explain ventilation when breathing out

What do artificial ventilators help people do?

What are ventilators?

Before ventilators there was a giant case (iron lung) which was from the neck to the abdomen, what happened when the air was pumped out of the case?

What happens when the air is pumped into the case?

Most ventilators work by pumping air into the lungs by doing what?

Ventilators don't affect the blood flow but what could they affect?