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Description of the Respiratory Tract of Man

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Description of the Respiratory Tract of Man Air is drawn in through the nose into the nasal cavity in which the air is warmed to the required temperature and filtered by nasal cilia. Next the air passes epiglottis, which is a flap of tissue that prevents food from passing into the trachea. ...read more.


The trachea then divides into two smaller tubes called bronchi, which also have 'C' shaped rings of cartilage. These carry air into each lung. Inside the lung, the bronchi divide into even smaller tubes called bronchioles. At the end of each of these bronchioles are small air sacs called alveoli the walls of which are only one cell thick. ...read more.


It is the diaphragm that controls the breathing process. It is a sheet of muscle that separates the thorax from the abdomen. While breathing in, the lungs increase in size and move upwards, when we breathe out the lungs move down and decrease in size. To prevent damage to the lung is the pleural membrane, which is filled with a thin layer of lubricating fluid so that movement is lubricated. To protect the thorax is the ribcage, which comprises of twelve sets of ribs. Amar Karia 01/05/2007 ...read more.

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