Compare how the human body breathes in and out. Describe what happens to the ribcage, the diaphragm and chest volume. (6 marks) In this question you get marks for how well your answer is written. You will get marks for: spelling grammar  organising your ideas and information clearly using key scientific words. Will give brainiest for best organised detailed answer. :)

•When we breathe in our rib cage swing upwards and outwards, diaphragm contracts and flattens, the expand and air is drawn in. The thorax also increases.
•When we breathe out our rib cage swing inwards and downwards, diaphragm relaxes and arches up, lungs become smaller and air is drawn out. The thorax size also decreases.
• During inhaling the concentration of oxygen is more
• During exhaling the concentration of carbon dioxide is more.

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