Nose: Difference between revisions

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{{otheruses}}
{{otheruses}}


The nose is the portion of the airway used to inhale and usually contains the sense recptors for the sense of smell.  
The nose is the portion of the airway used to inhale, and usually contains sense receptors for the [[sense of smell]] ([[olfaction]]).  
== Function ==
 


===  In mammals ===
===  In mammals ===
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As an interface between the body and the external world, the nose and associated structures frequently perform additional functions concerned with conditioning entering air (for instance, by warming and/or humidifying it) and by mostly reclaiming moisture from the air before it is exhaled (as occurs most efficiently in [[camel]]s).  
As an interface between the body and the external world, the nose and associated structures frequently perform additional functions concerned with conditioning entering air (for instance, by warming and/or humidifying it) and by mostly reclaiming moisture from the air before it is exhaled (as occurs most efficiently in [[camel]]s).  


In most mammals, the nose is the primary organ for [[olfaction|smelling]]. As the animal sniffs, the air flows through the nose and over structures called [[turbinate]]s in the [[nasal cavity]]. The turbulence caused by this disruption slows the air and directs it toward the [[olfactory epithelium]]. At the surface of the olfactory epithelium, [[odor]] molecules carried by the air contact [[olfactory receptor neuron]]s which transduce the features of the molecule into electrical impulses in the [[brain]].
In most mammals, the nose is the primary organ for [[olfaction|smelling]]. As the animal sniffs, the air flows through the nose and over structures called [[turbinate]]s in the [[nasal cavity]]. The turbulence caused by this disruption slows the air and directs it toward the [[olfactory epithelium]]. At the surface of the olfactory epithelium, [[odor]] molecules carried by the air contact [[olfactory receptor neuron]]s.  which transduce the features of the molecule into electrical impulses in the [[brain]].


In [[cetacean]]s, the nose has been reduced to the nostrils, which have migrated to the top of the head, producing a more streamlined body shape and the ability to breathe while mostly submerged. Conversely, the [[elephant]]'s nose has become elaborated into a long, muscular, manipulative organ called the ''trunk''.
In [[cetacean]]s, the nose has been reduced to the nostrils, which have migrated to the top of the head, producing a more streamlined body shape and the ability to breathe while mostly submerged. Conversely, the [[elephant]]'s nose has become elaborated into a long, muscular, manipulative organ called the ''trunk''.

Revision as of 12:55, 2 November 2006

Template:Otheruses

The nose is the portion of the airway used to inhale, and usually contains sense receptors for the sense of smell (olfaction).


In mammals

In most mammals, it also houses the nosehair, which catch airborne particles and prevent them from reaching the lungs. Within and behind the nose is the olfactory mucosa and the sinuses. Behind the nasal cavity, air next passes through the pharynx, shared with the digestive system, and then into the rest of the respiratory system. In humans, the nose is located centrally on the face; on most other mammals, it is on the upper tip of the snout.

As an interface between the body and the external world, the nose and associated structures frequently perform additional functions concerned with conditioning entering air (for instance, by warming and/or humidifying it) and by mostly reclaiming moisture from the air before it is exhaled (as occurs most efficiently in camels).

In most mammals, the nose is the primary organ for smelling. As the animal sniffs, the air flows through the nose and over structures called turbinates in the nasal cavity. The turbulence caused by this disruption slows the air and directs it toward the olfactory epithelium. At the surface of the olfactory epithelium, odor molecules carried by the air contact olfactory receptor neurons. which transduce the features of the molecule into electrical impulses in the brain.

In cetaceans, the nose has been reduced to the nostrils, which have migrated to the top of the head, producing a more streamlined body shape and the ability to breathe while mostly submerged. Conversely, the elephant's nose has become elaborated into a long, muscular, manipulative organ called the trunk.

Elephants have prehensile noses

Human nose

Shapes of the human nose

Culture

Some people choose to get rhinoplasty to change the aesthetic appearance of their nose. Nose piercings are also common, such as nostril, septum or bridge.

In New Zealand, nose pressing ("hongi") is a traditional greeting.

People famous for their noses

Template:Unreferenced

References

  1. Physical Manual: Univ. of Tennessee at Martin
  2. Eden Warwick (pseudonym of George Jabet), Nasology, or hints towards a classification of Noses, London, Richard Bentley, 1848
  3. Encyclopedia Britannica Micropedia, 1982

See also

External links

Template:Respiratory system Template:Human anatomical features

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