The human respiratory system consists of the lungs and other organs. Its main function is to take in oxygen and put out carbon dioxide. Oxygen in the air goes out of the lungs and into the blood, while carbon dioxide goes in the opposite direction.

The circulatory system is very useful. It helps the Respiratory system by transporting nutrients to keep the lungs clean, and healthy.The Digestive System provides our body with nutrients and the Respiratory System gives the Digestive oxygen.

Fun facts:
-The right lung is larger than left lung.
-Yawning happens when the brain detects low oxygen levels in lungs and it triggers back the response to the body, so that it can take in  large amounts of oxygen.
-An average person breathes in the equivalent of 13 pints of air every minute.
-Young children laugh for an average of 300 times in a day, whereas adults on average of 15 – 100 times in a day.
-Hiccups are caused by various things, and occur due to sudden movements in diaphragm.

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