Air passage way in humans

hope well thanks for your great support in the previous segments of this blog so in this segment of the blog i would like to talk about the the passage through which air from outside comes in to the body from nose or mouth to lungs and from where the exchange of respiratory gases takes place and that respired air goes outside the body and different components or parts of the body involved in the air passage way in human and the thing if you want to know any thing related to biology so please let me in the comment section so now start our topic
                  lets start
air passage way
in humans the air passage way consist of the way through which air that is rich in oxygen moves inside the body and ultimately to the lungs where the change of respiratory gases takes takes place and the air that has more concentration of carbon dioxide moves out so the parts involved in this passage are
*external nostrils  
*nasal cavity
*internal nostrils 

*air sacs 
external nostrils 
it is the outside part of the nose through which the air from outside moves inside the body 
nasal cavity
nasal cavity in humans is divided into two sections by a cartilage such that both sections of the nasal cavity have fine hairs in it and a layer of mucous such that both of them tarp all the particles from the air that are not needed inn the body such that the outside is also warned and become moist and become equal to the temperature of the body such that the function of nasal cavity is trapping any dust particles and warming the incoming air
internal nostrils 
through nasal cavity the air moves to the pharynx through two internal openings known as the internal nostrils 
the nasal cavity leads into the throat or pharynx by two internal openings known as the internal nostrils it is a muscular passage and is lined with mucous membrane and is common to both food and air such that the food through it moves to the esophagus and the air than moves into the larynx 
the larynx or voice box is a complex cartilaginous box surrounding the upper end of trachea such that the air from the pharynx into the larynx one of the cartilages the epiglottis has a muscularly controlled hinge like action and serves as a lid which automatically covers the opening of the larynx during the act of swallowing so as to prevent the entry of food or liquid in the larynx it is also known as the voice box it has two stands of stretched bands across it that are known as the vocal cords such that voice is produces when air strikes vocal cords and they vibrated
the upper end of the larynx is know as the glottis it is the part of the larynx that have vocal cords in it on its it is also covered by a mucous membrane it is guarded by a flap of tissues known as the epiglottis that prevents the entry of food into the larynx such that it is controlled by the movement of tongue such that when the food moves down the flap that is known as the epiglottis partially closes such that the partial closed epiglottis diverts the food into the esophagus and the air goes out normally  
trachea or wind pipe
wind pipe or trachea is a long muscular passage that also have cartilage in it such that it have C shaped cartilage rings that prevents it from collapsing even there is no oxygen in it it is of about 12cm average in humans that lie in the chest cavity ventral to the esophagus it takes oxygen from the larynx and divides into two bronchi such that each each bronchi moves into their their respective lung
bronchi and bronchioles 
such that bronchi also have cartilage it them same C shaped cartilages same as the trachea such that when each bronchi moves into its respective lung it divides and subdivides such that when their diameter becomes less than (mm) than it is know as bronchioles such that bronchi and bronchioles have cartilages in the start but loss it progressively when their diameter becomes very small and they end up into alveolar duct 
air sacs and alveoli 
such that bronchioles divides into alveolar duct than it alveoli such that alveoli are the primary surface of the lungs through which the exchange of gases takes takes place because it have blood capillaries  among them through which the exchange of respiratory gases takes place 


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