Asthma Healing

What are function and composition of the respiratory system?   The respiratory system is the organ keeping in touch with and taking a breath, made up of respiratory tracts and lung.

(一): Respiratory tracts

The respiratory tracts is the passway where the gas passed in and out the lung, from nasal cavity to trachea. Often regard ring cartilage of throat as the circle on clinic, divide it into upper respiratory tract and lower respiratory tracts two parts.

(1): The upper respiratory tract: Including the nose, swallows, throat. ①The nasal cavity of nasal cavity is the door of the respiratory tracts. Nasal cavity divide into nasal septum about two, the previous nostril and external world communicate, the back nostril, with swallowing linking up. The previous nasal cavity has vibrissas, play a filtering role in sucking the air, can reduce the sucking of harmful substances such as the dust,etc.. Whole nasal cavity mucous membrane for being false to reply layers of cilium column skin at the form, have, take a sniff at cell, cup cell and body of gland during that time, and quite abundant blood vessel. So, the nasal cavity can be enabled and sucked the gas to heat the humidification. And when the nasal cavity is stimulated by harmful gas or foreign matter, often sneeze, have a running nose and react, prevent the harmful thing from sucking, this is a kind of protective reflection movement, play a certain protection role in the human body. The nasal cavity is besides breathing described above, there is olfactory function; ② It is a slightly flat funnel shape pipeline before and after one to swallow, and swallowed the skin to make up by the mucous membrane. On connect by nasal cavity with,it is link with throat to leave, can divide nasopharynx, mouth swallowing and laryngopharynx three part, it is the common passways of respiratory system and digestive system. Swallowing has function swallowed and breathed, in addition it is an important pronunciation resonance organ to swallow, play a assisting role in pronouncing. The swallowing department has abundant lymphoid tissues, is made up of tonsil,etc. and swallow the lymphocytic ring, can defend bacteria and attack the swallowing department, relatively obvious in this kind of function of infancy; ③ The throat is on the throat and laryngopharynx, leave and link with trachea, it is the vocal organs too to breathe the passway. The support of the throat is mainly made up by epiglottic cartilage, first form cartilage and ring cartilage, cavity of larynx about all have one vocal cord, space of two vocal cord split for the glottis. When breathing or pronouncing, epiglottis open, air can come in and go out since, and when swallowing, the epiglottis is closed automatically, prevent the food from entering the trachea.

(2) Lower respiratory tracts: The lower respiratory tracts refers to the trachea, total bronchus, leaf, one section of bronchuses and branches at all levels, until the alveolus. The trachea is conducting some of gas.

(二):  Lung

The lung is the place of carrying on air exchange, the lung lies in the thorax, take the form of taper, the right lung is slightly bigger than the left lung. Dirty layers of pleura oblique to split, organize leaf divide lung into, and lay leaf thoroughly, right lung another competent to split, make it divide into upper, middle and lower 3 leaf. Two lungs each have lungs sharp, lung bottom and two sides. The lung is connected to diaphragm that the skin of diaphragm is upper at bottom. Lung door and mediastinum of the inboard of lung are depended on. Passway where the lung door is the bronchus, lung artery, pulmonary vein, nerve and lymphatic vessel passed in and out.