The breathing system 3.0 / 5 based on 1 rating ? BiologyRespiration and exerciseGCSEAQA Created by: hannahCreated on: 23-04-13 22:16 Thorax top part of body, separated from abdomen by diaphragm 1 of 11 Lungs big sponge, protected by ribcage 2 of 11 thrachea where air goes when you breathe in 3 of 11 bronchi trachea splits into two tubes called bronchi, one going to each lung 4 of 11 bronchioles bronchi split progressively into bronchioles 5 of 11 alveoli bronchioles split into small bags called alveoli 6 of 11 ventilation is breathing in intercostal muscles and diaphragm contract, thorax volume increases which decreases pressure which draws air in 7 of 11 ventilation is breathing out intercostal muscles and diaphragm relax, thorax volume decreases which decreases pressure so air is forced out 8 of 11 breathing in air goes in, muscles between ribs pull ribcage and sternum up and out, diaphragm flattens 9 of 11 breathing out air is forced out, ribcage and sternum drop in and down and diaphragm moves up 10 of 11 artificial ventilators move air into or out of the lungs, help people who cant breathe 11 of 11
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