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To breathe in and out we need to have a windpipe, also known as a trachea. But before this when we breathe in air is moistened and filtered through our nostrils, and then taken down the trachea. The lungs then get bigger as the diaphragm moves down to make the pressure decrease, this way more air is allowed in and furthermore the ribcage also pushes out to make more room for air to come in. The alveoli are tiny air sacs, at the end of bronchioles which are one cell thick. They expand to let air in and because they are so thin it allows oxygen to diffuse into the blood. At the same time you get the carbon dioxide from the blood trying to leave the body, so they go into the alveoli. yeahhh mann

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