Let us begin by taking a look at the structure of the respiratory system and how vital it is to life. The sinuses have two principal functions: because they are filled with air, they help keep the weight of the skull within reasonable limits, and they serve as resonance chambers for the human voice. It includes your airways, lungs, and blood vessels. The nose and nasal cavity form the main external opening for the respiratory system and are the first section of the bodys airwaythe respiratory tract through which air moves. This structure provides humans with the sense of smell while also fi ltering, warming, and moistening inhaled air. Hairs in your nose help filter out large particles. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Tiny hairs, called cilia, along your air passages move in a sweeping motion to keep the passages clean. Major organs of the respiratory system The major respiratory structures span the nasal cavity to the diaphragm. Without it, we would cease to live outside of the womb. The nose is the external protuberance of an internal space, the nasal cavity. George Holt Professor of Pathology, University of Liverpool. Notes: Human Respiratory System Page 2 of 11 The Upper Respiratory Tract A. Nasal Cavity Consists of: o Nostrils (openings in the nose) o Turbinates (Small bones in the nose) o The turbinates are covered with a membrane that secretes mucus to moisten air coming into the nose. How Does the Respiratory System Clean the Air? The nasal cavity is a hollow space within the nose and skull that is lined with hairs and mucus membrane. Atmospheric air is pumped in and out regularly through a system of pipes, called conducting airways, which join the gas-exchange region with the outside of the body. Breathing In and Speaking Out: How the Structures of the Upper Respiratory System Work. Two regions of the nasal cavity have a different lining. The pharynx serves as a passageway for both air and food. Take this multiple-choice quiz on the human respiratory system and share with your friends too. The following are the five key functions of the respiratory system. After oxygen enters the blood, it travels through the body and is picked up by red blood cells. The lungs serve as the gas-exchanging organ for the process of respiration. The human respiratory system is a system of organs responsible for inhaling oxygen and exhaling carbon dioxide in humans. ", American Medical Association: "Respiratory System: Basic Function. The passageways thus formed below each ridge are called the superior, middle, and inferior nasal meatuses. All the best and keep reading up on it and its functions! The human respiratory system is responsible for helping provide oxygen to cells, remove carbon dioxide from the body, and balance the pH of the blood. Alveolus. Air moves through the nose to tube at the back of the mouth called the Pharynx, or throat. Typically, the mucosa of the nose contains mucus-secreting glands and venous plexuses; its top cell layer, the epithelium, consists principally of two cell types, ciliated and secreting cells. The upper airway system comprises the nose and the paranasal cavities (or sinuses), the pharynx (or throat), and partly also the oral cavity, since it may be used for breathing. The Human Body Book: The Respiratory System The human lungs are amazing feats of nature. This structural design reflects the particular ancillary functions of the nose and of the upper airways in general with respect to respiration. Correspondingly, they are called the maxillary sinus, which is the largest cavity; the frontal sinus; the ethmoid sinuses; and the sphenoid sinus, which is located in the upper posterior wall of the nasal cavity. After absorbing oxygen, blood goes to your heart. On each side, the intranasal space communicates with a series of neighbouring air-filled cavities within the skull (the paranasal sinuses) and also, via the nasolacrimal duct, with the lacrimal apparatus in the corner of the eye. Respiration is the process of obtaining and using oxygen, while eliminating carbon dioxide. Corrections? © 2005 - 2019 WebMD LLC. The human respiratory system, showing the trachea, bronchioles, and lungs. The alveoli are surrounded by a mesh of tiny blood vessels called capillaries. Please refer to the appropriate style manual or other sources if you have any questions. These parts work together to move oxygen throughout … Here, oxygen from inhaled air passes into your blood. Please select which sections you would like to print: While every effort has been made to follow citation style rules, there may be some discrepancies. The respiratory system consists of the nose, pharynx, larynx, trachea, bronchi, and lungs. Signs of this potentially fatal complication. The Human Respiratory System Biology 314 Mr. Doron Game Plan Introduction to the respiratory system Pathway the air takes Role of the nasal cavity Role of the pharynx ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3d7b7d-ZTg1Z It travels down the back of your throat and into your windpipe, which is divided into air passages called bronchial tubes. They are also adapted to protect the organism from the invasion of pathogens along those surfaces. The nose is a structure of the face made of cartilage, bone, muscle, and skin that supports and protects the anterior portion of the nasal cavity. The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. WebMD does not provide medical advice, diagnosis or treatment. The Respiratory System is vital to every human being. ", American Lung Association: "Learn About Your Respiratory System. 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