ALL ABOUT THE NOSE! =D

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DUNMAN HIGH school FOUR I!<3 a bunch of people highly interested in the functions of our HOLY NOSE.=)

INTRODUCTION

Main structure

The Nose, is an organ of smell, and also part of the apparatus of respiration and voice. It can be divided into an external portion - the visible projection portion, to which the term nose is popularly restricted and an internal portion- consisting of two principal cavities (nasal fossae) separated from each other by a vertical septum, and subdivided by spongy or turbinated bones that project from the outer wall into three passages (meatuses), with which various sinuses in the ethmoid, sphenoid, frontal, and superior maxillary bones communicate by narrow openings.

INSIDE THE NOSE

The margins of the nostrils are usually lined with a number of stiff hairs (vibrissae) that project across the openings and serve as a filter in the passage of foreign substances, such as dust and small insects, which might otherwise be drawn up with the current of air intended for respiration. The skeleton, or framework, of the nose is partly composed of the bones forming the top and sides of the bridge, and partly of cartilages. On either side are an upper lateral and a lower lateral cartilage, to the latter of which are attached three or four small cartilaginous plates, termed sesamoid cartilages. The cartilage of the septum separates the nostrils and, in association posteriorly with the perpendicular plate of the ethmoid and with the vomer, forms a complete partition between the right and left nasal fossae. The nasal fossae, which constitute the internal part of the nose, are lofty and of considerable depth. They open in front through the nostrils and behind end in a vertical slit on either side of the upper pharynx, above the soft palate, and near the orifices of the Eustachian tubes, leading to the tympanic cavity of the ear. In the olfactory region of the nose the mucous membrane is very thick and colored by a brown pigment. The olfactory nerve, or nerve of smell, terminates in the nasal cavity in several small branches; these ramify in the soft mucous membrane and end in tiny varicose fibers that in turn terminate in elongated epithelial cells projecting into the free surface of the nose

FUNCTIONS
The uppermost portion of the human respiratory system, the nose is a hollow air passage that functions in breathing and in the sense of smell. The nasal cavity moistens and warms incoming air, while small hairs and mucous filter out harmful particles and microorganisms. This illustration depicts the interior of the human nose. When smell-producing chemicals come into contact with the upper portion of the nasal passage, the smell is carried by nerve fibres through the roof of the nose into the brain.

Air normally enters the nose where it is:

1. Warmed

2. Filtered from large particles

3. Moistened

These three functions are performed as the air passes over ridges named the Superior, middle and inferior conchea and also as the air passes through the folds between the conchea termed the superior, middle and inferior meatus. All these structures are highly vascularised and moistened by copious amount of mucus. This rich blood supply causes the air to be warmed to almost body temperature. As hot air can contain a higher amount of moisture, the air is also humidified to almost 100% as it passes through the nose. Apart from heating and moistening the air, the conchea produce turbulence in the incoming air. This turbulence would induce any large particles including dust and bacteria, to stick to the mucus. Thus the air is also filtered as it is passing through the nose. This function is complimented by the presence of hairs at the entrance of the nose that trap the very large particles. Apart from the "airconditioning" function, the nose accommodates the sense of smell, through the presence of special neuroepithelium . These sensory nerve endings are stimulated by chemicals that dissolve in the moist coating. Vocal sounds are also produced in the nasal cavity thus aiding in vocalisation.

NOW AREN'T YOU MORE EQUIPPED WITH MORE KNOWLEDGE ON THE NOSE?=)))))

Saturday, March 01, 2008

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yes,im here again to contribute to my second post, this is a very interesting post about Amazing Dog Noses!this is PRIDA!

do you know that noseprints saves dog lives!?yes,thats absolutely true=)Nose prints are used to identify dogs in the same way finger prints are used to identify human beings. Breeders and trainers keep a dog's nose prints on file as part of its permanent record and insurance companies now require them whenever a dog is to be bonded. At one time paw prints were used as a means of canine identification, but these proved less accurate than noses. And while some owners have had microchips "installed" in their pets, these are more invasive and can be detected and removed. If you dog is ever lost or stolen, having his nose print on record could save his life!

and have you ever wondered to yourself why are dog noses always wet? and this is the time to correct yourself if you have always thought that that unpleasant fluid was urine!?! It is actually fluid from the lateral glands in a dog's nose lubricates the outsides of his nostrils and makes them moist and shiny. But mostly, the nose stays wet because your dog is always licking it (along with other parts). So, a moist nose has generally been considered as a healthy nose, but this isn't always true. For example, if a dog falls asleep in a hot place, his nose may be dry when he first wakes up. Once he cools down ,it gets rehydrated, his nose will soon look wet again.

Distemper can permanently alter the nasal glands. So, a dog who suffers from distemper early in life may have a perpetually dry nose.

andwhy are dog noses cold?old normally goes along with wet, which I heard has something to do with convection cooling, or some such law of physics, which I've long forgotten. So, if a dog's nose dries out (see above), it will feel warm to the touch. This is OK, as long as the nose gets wet again. However, a chronically dry nose could be sign of illness and should be seen by a vet.

Dog noses are hard to fool!We know that dogs have traditionally been used for tracking, search and rescue due to their keen sense of smell.

A dog's sense of smell is about 40,000 times better than ours, and that's not all. You can't throw a dog off by "covering up" one smell with another. A study was done in which a number of different objects were sprayed with skunk odor, and trained tracking dogs were still able to distinguish the objects from each other! So forget about trying to fool Fido!

Here's another intriguing story about the dog's famous sense of smell: A yellow lab named Parker wasn't a trained "nose dog", but liked to sniff everything, all the time. Then he began to constantly sniff a blemish on his owner's leg, which had been there for a number of years. The dog was pushing his nose hard into the area, and really concentrating. So, the owner decided to have it looked at. The skin specialist immediately detected the early signs of skin cancer, and ordered the blemish removed immediately. Once the lesion was gone, Parker lost interest in the leg! Similar stories have reportedly led doctors in the US to train dogs to "sniff out" skin cancer. Apparently, dogs can detect skin cancer long before any conventional methods can!! More recently, dogs have been given urine samples from cancer victims to see if they can also smell bladder and prostate cancer. The results have been promising.

okay,thats all for today!=)

love,prida!

posted at 9:58 AM

end of post

LINKSSSS/BIBLOGRAPHY!=)

'MUCUS`1! =D
'NOSEPICKING! =D
'deviated septum =D
'sneezing =D
'NOSE SHAPE! =D
'MUCUS`2! =D
'air that enters the nose =D
'dog NOSES! =D
'rhinoplasty! =D
'the nose=D
'nose intro =D

thanks to
photoshop 7.0
KIAYI for the codes
PRIDAA for UGLY MAKING OF BLOGSKIN HAHA!
`blogger
`colour codes

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WELCOME=)
HELLO=)don't you wanna know more about the nose? yes!so.. LETS BE NOSEY.frequent this blog to know more about the nose,this very important organ in our body!ENJOY!^^ =D