Ventilators have become the single most important piece of medical equipment for critically ill coronavirus patients whose damaged lungs prevent them from getting enough oxygen to vital organs.

The machines work by forcing air deep into the lungs, dislodging the fluid and accumulated pus that interfere with the exchange of oxygen, a process orchestrated by tiny air sacs known as alveoli.

It’s still not clear how lungs are affected by Covid-19.

Lungs are complex organs that deliver oxygen to the bloodstream and keep organs functioning.

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