Air is an important element in maintaining the life of all living organisms. At the time of oxygen deficiency, damage occurs in the body at the cellular level, which entails its death.

The device and mechanism of action of the human respiratory system

The entire respiratory system consists of:

1. The nose. With this organ, the entire respiratory process begins. Air enters through the nostrils from the outside and exits, through the choanas, into the nasopharynx.
   Nasopharynx. In the nasopharynx, the two systems are the respiratory and digestive. The respiratory system is protected from food by the valve (epiglottis).
2. Trachea. The trachea is a kind of tunnel for the passage of air into the lungs and back. On the surface of the trachea there are micro-cilia, which push dust particles along with mucus back into the throat.
3. The bronchial tubes. They are divided into small branches, thus forming a tree (bronchial) from the processes (bronchioles).
4. Lungs. They are located in the upper body and are located on both sides of the heart. The lungs are divided into several lobes. The right consists of three such shares, and the left of two. Due to this, if you remove any part (share), the lungs continue to work and serve the person.

Air passes through the nose, enters the throat, and then into the trachea. It is a tube of ring-shaped cartilage, which branches into 2 tubes (main bronchi) entering the lungs and form a tree there (bronchial).Air entering the nasopharynx is heated and moistened, while all microbes and dust particles are trapped by the mucous membrane. This stage of warming and purifying the air is very important, so you should breathe through your nose, as this does not happen when you inhale it with your mouth. Further, the air through the small bronchioles enters the lungs.

The main organ of the respiratory system is the lungs. The lung has the structure of a sponge (vesicles), which is protected on the surface of a thin pleural. The lower part of the lungs rests on the diaphragm (the main muscle involved in breathing). While the diaphragm contracts, it lowers and a breath occurs. When she relaxes, she returns to her original position, lifting her lungs, while exhaling occurs. This important respiratory organ provides all organs with oxygen, having previously cleaned it of processed (carbon dioxide). After that, air enters every cell of the human body.