| The Respiratory System |
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| The respiratory system is the system of the body that deals with
breathing. When we breathe, the body takes in the oxygen that it needs and
removes the carbon dioxide that it doesn't need. |
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| First the body breathes in the air which is sucked through the
nose or mouth and down through the trachea (windpipe). The trachea is a pipe
shaped by rings of cartilage. It divides into two tubes called bronchi. These
carry air into each lung. Inside the lung, the tubes divide into smaller and
smaller tubes called bronchiolies. At the end of each of these tubes are
small air balloons called alveoli. |
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| Capillaries, which are small blood vessels with thin walls, are
wrapped around these alveolies. The walls are so thin and close to each other
that the air easily seeps through. In this way, oxygen seeps through into the
bloodstream and carbon dioxide, in the bloodstream, seeps through into the
alveoli, and is then removed from the body when we breathe out. |
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| The diaphragm is the muscle that controls the breathing process.
As the diaphragm flattens, it causes the chest to expand and air is sucked
into the lungs. When the diaphragm relaxes, the chest collapses and the air
in the lungs is forced out. |
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To see some amazing facts about the Respiratory System |
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