The breath mechanism in a human body - rather interesting subject for knowledge. Processes, imperceptible for the person, are very surprising, especially considering the fact that without breath the organism cannot just exist.
Instruction
1. In a human body breath is called process of ventilation of lungs during which there is an intensive gas exchange between atmospheric air and blood. The mechanism of breath can be divided into two components conditionally: physiological and biochemical. Besides, during breath in an organism there is a set of the most various processes providing both activity, and perception of the world around.
2. The mechanics of respiratory process is quite simple. In a thorax of a human body there is a closed cavity in which the largest bodies - lungs are located. Internal pressure in a thorax is much lower atmospheric and therefore the surface of lungs densely adjoins to internal walls of free space. Thus, expansion and narrowing of volume of lungs happens due to change of the sizes of the camera in which they are located.
3. It is possible to allocate two types of breath which are classified by the principle of expansion of an internal cavity. It is chest type of breath at which the area of a thorax extends a raising of edges, and belly type in the course of which the diaphragm - the thin plate separating a chest cavity from belly participates. The diaphragm has the convex form and its dome is directed up. At reduction of muscles of an abdominal cavity it stretches and leveled at the expense of what there is an expansion of volume of a thorax.
4. The internal structure of lungs reminds very soft sponge which consists of the infinite number of blood vessels with very thin walls capable to pass through itself molecules of gases. Such vessels are called alveoluses, and their main function is to provide mediocre contact of blood with atmospheric air.
5. Blood contains three types of blood cells. Erythrocytes, or red blood cells, contain hemoglobin - complex protein with the high content of low-valent iron. The main function of hemoglobin - reversible accession to of molecules of gases and their subsequent transfer in fabric of a living organism. Thus, at hit in an alveolus of a blood cage which contains hemoglobin the last attaches to itself(himself) several molecules of oxygen and transports them in an organism. In the course of a metabolism there is a combustion of oxygen therefore carbon dioxide is formed. he, in turn, also joins hemoglobin and is had back to alveoluses of lungs where there is its replacement in the exhaled air.
6. In the course of breath not only the gas exchange is carried out. The air flow passing through the upper airways strengthens work of the receptors reacting to its chemical composition. So the person catches smells. When pronouncing the speech the vocal chords only regulate a timbre of a voice and provide generation of vowels while lungs, at exhalation, provide the necessary pressure of air thanks to what there is possible a pronunciation of consonants and also voice force appears.