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Anatomy of the paranasal sinuses; drawing shows front and side views of the frontal sinus, ethmoid sinus, maxillary sinus, and sphenoid sinus. The nasal cavity and pharynx (throat) are also shown.

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When essential oils are inhaled through the nose, tiny nerves send an immediate signal to the brain and go straight to work on the systems that moderate our minds and bodies. Inhalation can be the most direct delivery method of these incredibly nurturing components in essential oils, since the chemical messengers in the nasal cavity have direct access to the brain.

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Himalayan Iris Pollen in REM. Most of our flowers and fruit have pollen which is entomophilous (i.e.carried by animals) and designed to stick to the leg of a bee or moth etc. Such grains tend to be like burs, with all sorts of strange miniscule hooks and spikes (they thus pose less of a problem for allergy sufferers–since they never make it to the nasal cavity). Other plants literally cast their hopes upon the wind. These anemophilous pollens are produced in large quantities.

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The Nose The nose, a prominent feature of the face, is the only external portion of the respiratory system. Air enters the nose through external openings called nostrils. The nose contains two nasal cavities, which are narrow canals separated from one another by a septum composed of bone and cartilage (Fig. 14.2). Mucous membrane lines the nasal cavities.

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Physiology Review Conducting Zone Made up of rigid passageways that serve to warm, moisten, and filter the inhaled air: nose, nasal cavity, pharynx, larynx, trachea, primary bronchi, tertiary bronchi, bronchioles, terminal bronchioles. Air passages undergo 23 orders of branching in the lungs which significantly increases cross sectional area for flow

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Micrococcus luteus (M. luteus), is a Gram-positive bacteria, 0.05 to 3.5 microns in diameter, that is most commonly found in mucous membranes such as the nasal cavities, the upper respiratory tract, and the lining of the mouth. If we were to break down the word Micrococcus, it would be as follows: Micro, for microscopic; coccus for the organism's spherical shape; luteus for "yellow". The bacteria is also found in dust, soil and the air that we breathe, and is part of the human skin flora.

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