clean After passing through the nose, which is responsible for heating the air, humidify, and to consider canceling the air through the pharynx, the larynx, which is located on top of the trachea. Here, the epiglottis is attached as a safety lock. It closes when swallowing food and drink the larynx. Sitting in the larynx, the vocal cords and with the air flowing through our voice is formed. Now the air entering the trachea. It is made of cartilage rings that they can not coincide. They branched out now like a big tree.
first into two branches, then each in a lung, always Next to the finest Luftröhrenästchen (bronchioles) and called as the last of the alveoli, and alveoli. Its surface would result in a field of about 100 square meters - more than 50 times the skin's surface by an adult! Hard to imagine!
Here, gas exchange takes place by a thin membrane. Dating back to the body cells carbon dioxide is released and taken to the air inhaled oxygen. Everything is controlled by the respiratory center. Normally we breathe about 16 times per minute. At a breath (inhaling and exhaling) are about four heartbeats. Every breath provides our up to 120 billion body cells with oxygen. Once the breathing is interrupted will start to crave them after oxygen, because the amount present in the blood only lasts for a few seconds. Therefore, it is impossible to us by simply breath-hold us to choke themselves - the demand for oxygen is too strong. Our body is programmed to life support, would not allow it.
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