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The human nose is the first organ of the respiratory system.It is also the principal organ in the olfactory system.The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two.
[3] [4] It may prevent the collapse of the nostril during inhalation, particularly in people with narrower nostrils. [4] The respiratory centre of the brainstem can use the muscle to control nostril width in relation to breathing. [3] [5] It also moves the tip of the nose slightly. [2]
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 October 2024. Organ that smells and facilitates breathing For other uses, see Nose (disambiguation). This article is about noses in general. For the article about noses in humans, see Human nose. Nose Nose of a dog Details Identifiers Latin nasus MeSH D009666 TA98 A06.1.01.001 A01.1.00.009 TA2 117 ...
The T-cell population contains about 3–4 times more CD4 + T cells than CD8 + T cells. Most of T cells are with αβ T cell receptor (TCR) and only few are with γδ TCR. CD4 + T cells are in naive state, marked by high expression of CD45RB. B cells are mostly in unswitched state, with sIgM + IgD + phenotype. [3] [4]
A nostril (or naris / ˈ n ɛər ɪ s /, pl.: nares / ˈ n ɛər iː z /) is either of the two orifices of the nose. They enable the entry and exit of air and other gasses through the nasal cavities. In birds and mammals, they contain branched bones or cartilages called turbinates, whose function is to warm air on inhalation and remove moisture ...
(The conducting zone—which also includes the nostrils of the nose, the larynx, trachea, bronchi, and bronchioles—filters, warms and moistens air and conducts it into the lungs). [1] The human pharynx is conventionally divided into three sections: the nasopharynx , oropharynx , and laryngopharynx .
The epithelium of the nasal mucosa is of two types – respiratory epithelium, and olfactory epithelium differing according to its functions. In the respiratory region it is columnar and ciliated. [3] [4] Interspersed among the columnar cells are goblet or mucin cells, while between their bases are found smaller pyramidal cells.
It is exposed to the drying effect of inhaled air. [3] It can also be damaged by trauma from a finger nail (nose picking), as it is fragile. [3] [4] It is the usual site for nosebleeds in children and young adults. [3] [5] A physician may use a nasal speculum to see that an anterior nosebleed comes from Kiesselbach's plexus. [6]
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