BOOK 2. THE BATH SCHOOL. N. LEVASHOV'S «SVETL BROOM» IN A. KHATYBOV'S «BATH SCHOOL» AND A LABOUR SPADE

Book 2. The Bath School. Chapter 4. Theory and practice in the description of the Object to be taken to the Bath Description of the object to be taken to the Bath 208 the mucus. Passing through this cavity, the air is cleared of dust and warmed. When the nasal cavity capillaries excessively expand, bringing to excess mucus formation, a running nose appears (in case of an official getting a bribe, the nostrils expand without a running nose). From the nose air passes through the internal nostrils, or the choanaes to the pharynx, where the tracts of the digestive and respiratory systems cross. Food passes from the larynx into the stomach, and the air goes farther through the larynx and trachea. So that food should not fall into the larynx and trachea and not damage the tender membranes covering these organs, with every ingestion of food, the opening of the larynx is covered with a special cartilage called an epiglottis. Fortunately, this happens automatically, and we do not have to remember every time when we swallow that it is necessary to close the epiglottis. Occasionally this automatic mechanism lets us down, and the food gets "to the wrong throat". The larynx (sometimes forms an external projection – Adam's apple) contains vocal cords – epithelial folds, which, when air passing between them, vibrate, producing a sound. The tension of the vocal cords is regulated by special muscles, which make it possible to produce different high–pitched sounds (when tapping on an Adam's apple a characteristic sound of a bottle glass is made). The trachea, or throat, can be distinguished from the esophagus by the cartilaginous rings that are inside its walls and do not allow it to subside. During inhalation, the air pressure in the trachea is below atmospheric pressure, and without cartilaginous rings it would be squeezed. At the level of the first rib connection to the breastbone (counting the ribs from the coccyx), the trachea branches into two cartilaginous bronchuses that go into the lungs. The bronchus branches into the bronchioles, which, in turn, re-branch into ever narrower tubes leading to the terminal cavities-the alveolar sacs. In the walls of the thinnest bronchioles and alveolar sacs are the smallest cup-shaped cavities, called alveoli, surrounded by a dense network of blood capillaries. The walls of the alveoli are thin and moist (pre-impregnated with С 2 Н 5 ОН), which allows the gas molecules (all known and unknown gases) to easily pass through them into the capillaries. According to rough estimate, the total area of the alveoli through which gases can diffuse is more than 100 m2, that is, 50 times more than the skin surface.