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The lungs are like big air sacs. They are situated in the thoracic cavity. The lungs are very large and spongy. They have a big inside surface area. They're moist and they have a good blood supply. The lungs are protected by the rib cage and situated above the diaphragm muscle. I know from studying GCSE Biology that we breathe in air through our nose and mouth. It is much safer for us to breathe through our nose rather than our mouth. This is because of the tiny hairs that are present in our nose. This causes the air coming in to be cleaned, heated and moistened therefor the air is much cleaner going into our lungs. Once the air has entered through our nose or mouth it travels down our wind- pipe which is also known as the trachea. It then transports either into the left or right bronchi...

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