HUMAN BODY RESPIRATORY SYSTEM

WITH EVERY BREATH ,air passes through the nasal cavity..down the pharynx(throat),larynx("voice box" ),and trachea(wind pipe) to the lungs.The nasal &nb sp; cavity warms the and moistens air ,and the tiny layers in the lining protect the airway against the damage by foreign bodies.During swallowing , the tongue moves up and back,the larynx rise,the epiglottis closes off the entrance to the trachea, and the soft palate separates the nasal cavity from the pharynx.Saliva,
secreted from three pairs of salivary glands,lubricates food to make swallowing easier,it also begin the chemical break down of food ,and help to produce taste.The senses of taste and smell are closely linked .Both depend on the detection of dissolved molecules by sensory receptors in the olfactory
nerve endings of the nose and in the taste buds of the tongue.

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