File Name: parts of the nose and their functions .zip
The nose L. The nose functions in smell and provides filtered, warm, moist air for inspiration. The external nose presents a root or bridge , a dorsum, and a free tip or apex.
This series looks at the structure and function of the respiratory system and describes the mechanics of breathing. Each of the cells in the body needs a supply of oxygen in order to function as well as a means to expel the carbon dioxide produced. The respiratory system along with the cardiovascular system is largely dedicated to supplying these needs.
Nose , the prominent structure between the eyes that serves as the entrance to the respiratory tract and contains the olfactory organ. It provides air for respiration , serves the sense of smell , conditions the air by filtering, warming, and moistening it, and cleans itself of foreign debris extracted from inhalations.
The nose has two cavities, separated from one another by a wall of cartilage called the septum. The external openings are known as nares or nostrils. The roof of the mouth and the floor of the nose are formed by the palatine bone , the mouth part of which is commonly called the hard palate ; a flap of tissue , the soft palate , extends back into the nasopharynx , the nasal portion of the throat , and during swallowing is pressed upward, thus closing off the nasopharynx so that food is not lodged in the back of the nose.
The shape of the nasal cavity is complex. The forward section, within and above each nostril, is called the vestibule. Behind the vestibule and along each outer wall are three elevations, running generally from front to rear. Each elevation, called a nasal concha or turbinate, hangs over an air passage.
Beside and above the uppermost concha is the olfactory region of the nasal cavity. The rest of the cavity is the respiratory portion.
The respiratory area is lined with a moist mucous membrane with fine hairlike projections known as cilia, which serve to collect debris. Mucus from cells in the membrane wall also helps to trap particles of dust, carbon, soot, and bacteria. Sinus cavities are located in the bony skull on both sides of the nose. In the olfactory smelling portion of the nose, most of the lining is mucous membrane.
A small segment of the lining contains the nerve cells that are the actual sensory organs. Fibres, called dendrites , which project from the nerve cells into the nasal cavity, are covered only by a thin layer of moisture. The moisture dissolves microscopic particles that the air has carried into the nose from odour-emitting substances, and the particles dissolved in the fluid stimulate the olfactory nerve cells chemically. Nose Article Media Additional Info. Print Cite verified Cite.
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Sagittal view of the human nasal cavity. Read More on This Topic. The nose is the external protuberance of an internal space, the nasal cavity. It is subdivided into a left and right canal by a thin medial The olfactory epithelium, found within the nasal cavity, contains olfactory receptor cells, which have specialized cilia extensions. The cilia trap odour molecules as they pass across the epithelial surface. Information about the molecules is then transmitted from the receptors to the olfactory bulb in the brain.
Get a Britannica Premium subscription and gain access to exclusive content. Subscribe Now. Learn More in these related Britannica articles:. It is subdivided into a left and right canal by a thin medial cartilaginous and bony wall, the nasal septum. Each canal opens to the face by a nostril and into…. The latter pathway becomes important when eating, and, as a result, there is considerable confusion in the use of the term taste , because odours from the food enter….
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The bone and cartilage under the skin give the nose most of its size and shape. Other structures inside and behind the nose help you breathe. Learning the anatomy of the nose can help you better understand how the nose works. This supports the bridge of the nose. The upper cartilage supports the side of the nose. The lower cartilage adds support, width, and height.
A big batch of cookies coming out of the oven. Your gym bag full of dirty clothes. How do you smell these smells and thousands more? It's your nose, of course. Your nose lets you smell and it's a big part of why you are able to taste things. The nose is also the main gate to the respiratory system, your body's system for breathing. Let's be nosy and find out some more about the nose.
Air comes into the body through the nose. As it passes over the specialized cells of the olfactory system, the brain recognizes and identifies smells. Hairs in the nose clean the air of foreign particles. As air moves through the nasal passages, it is warmed and humidified before it goes into the lungs. The most common medical condition related to the nose is nasal congestion. This can be caused by colds or flu, allergies, or environmental factors, resulting in inflammation of the nasal passages. Nosebleeds, known medically as epistaxis, are a second common medical issue of the nose.
The vestibule: The most anterior part of the nose. The Respiratory area: The rest of the nasal cavity. Lined by Respiratory function: Air way, purification of air.
The human nose is the most protruding part of the face. It bears the nostrils and is the first organ of the respiratory system. It is also the principal organ in the olfactory system.
Click Image to Enlarge. Your nose helps you to breathe and to smell. The inner part of the nose is above the roof of the mouth.
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The human nose is more than just a flap of flesh and cartilage on the front of the face.