The Respiraory System-Short Definition

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Parts Pharynx Function and Description The pharynx is a muscular, funnel-shaped tube about 5 inches long that connects the nasal and oral cavities to the larynx. The pharynx houses the tonsils and the adenoids, which are lymphatic tissues that guard against infection by releasing white blood cells . Cartilaginous plates (instead of c-shaped rings of trachea).The bronchial tubes are a pair of tubes that connect the trachea to the two lungs. The bronchial tubes branch out at the lungs into smalle
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    PartsFunction and Description Pharynx The pharynx is a muscular, funnel-shaped tube about 5 inches long that connects the nasal andoral cavities to the larynx. The pharynx houses the tonsils and the adenoids, which arelymphatic tissues that guard against infection by releasing white blood cells .Bronchial TubesCartilaginous plates (instead of c-shaped rings of trachea).The bronchial tubes are a pair of tubes that connect the trachea to the two lungs. The bronchial tubes branch out at the lungsinto smaller tubes called bronchi and then into much smaller tubes called bronchioles, whichcontain small air sacs that function as the exchange points for the two gases oxygen and carbondioxide.LungsFill thoracic cavity. Tissue is porous and spongy- it floats. The lungs, as before stated are pumps. They pull in oxygen and absorb the oxygen into thelining of the lungs. Then pushes the oxygen into the chambers of the heart so the oxygen cantravel to the rest of the body.Nasal CavityContains nasal septum, turbinates’’, and cilia. Responsible for the following functions: Filtering -the hairs etc in your nose clean and filter air particles to prevent inhalingdisease/pollution/infection into your lungs. The nasal passage warms or cools the air. There arereceptors which moisten the air and Sense of smellMouthIt's an organ of speech since the tongue, the teeth, the lips and its palate play a major role informing speech sounds.Passage of the air we breathe and carbon dioxide we release.EpiglottisWhen food is swallowed, this closes over the opening to the larnyx, preventing food fromentering the lungs. It blocks off food and water (liquid) from entering the trachea. It also allowsair to pass through the pharynx into the rest of the respiratory system. It basically prevent foodand water from going into the lungs. Thyroid Cartilage The thyroid cartilage forms the bulk of the anterior wall of the larynx, and serves to protect thevocal folds ( vocal cords ), which are located directly behind it. It also serves as an attachmentfor several laryngeal muscles. TracheaWindpipe. 4.5 long. Walls are alternate bands of membrane and c-shaped rings of hyalinecartilage to keep it open. Lined with ciliated mucous membrane. Coughing and expectorationgets rid of dust-laden mucous. It is lined with goblet cells and ciliated epithelial cells, whichproduce mucus.Pleura The pleura is a serious membrane which folds back onto itself to form a two-layered, membranestructure. The thin space between the two pleural layers is known as the pleural cavity.Bronchioles Thinner walls of smooth muscle, lined with ciliated epithelium. Subdivision of bronci. At the end,alveolar duct and cluster of alveoli. It is the transitional zone concerned with both air conductionand gas exchange between air and blood.AlveoliComposed of single layer of epithelial tissue. Inner surfaces covered with surfactant to keep  from collapsing. Each surrounded by capillaries. Oxygen and carbon dioxide exchange takesplace between these and capillaries. The functional unit of lungs is tiny air sacs that arise frombronchioles called alveoli. These terminal air sacs is the area where exchange of gases takesplace within the lungs. This air exchange consists of absorption of oxygen and removal of carbon dioxide. In the following paragraphs, you shall learn more about the alveoli function andstructure.
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