Lungs and Breathing The lungs, the breathing system, and diffusion through cell membranes. 3.0 / 5 based on 4 ratings ? BiologyRespiration and exerciseGCSEAll boards Created by: TiulaCreated on: 09-04-10 12:18 What is the thorax? The upper part of your body 1 of 6 What is the first part of breathing in? Intercostal muscles contract 2 of 6 Why does the diaphragm drop down? To create more space in the thorax 3 of 6 When air is pulled in, what is the order of tubes? trachea - bronchus - bronchiole - alveoli 4 of 6 When the diaphragm muscle relaxes, which way does the diaphragm move? Up 5 of 6 Where does gas exchange take place? In the alveoli 6 of 6
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