TRIPLE SCIENCE: The Breathing System 0.0 / 5 ? BiologyRespiration and exerciseTriple ScienceGCSEAQA Created by: AngeleSofiaCreated on: 06-06-16 19:22 Define Ventilation. The movement of air into and out of the lungs. 1 of 6 Why is ventilation needed? So oxygen from the air can diffuse into the blood stream (and into cells for respiration) and so oxygen can diffuse out of the blood. 2 of 6 When we breathe in the intercostal muscles and diaphram... contract. Pressure falls. 3 of 6 When we breathe out the ribcage and sternum move... down and in. Pressure rises forcing air out of the lungs. 4 of 6 What is an artificial ventilator? a machine that moves air in and out of the lungs. 5 of 6 Explain how a modern artificial ventilator works. Air is pumped into the lungs, which expands the ribcage. When it stops pumping, the ribcage relaxes as pushes air back out of the lungs. 6 of 6
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