Respiratory system diagram

Human respiratory system class 7
Respiratory system parts and functions
Respiratory system pdf notes

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The respiratory tract is comprised of nasal cavity, nasopharynx, throat, trachea and finally lungs. The inhaled air is moisturized, heated, cleared and afterwards conveyed into the lungs through nasopharynx and throat. Oxygen in the air that is inhaled is diffused into the blood via tiny bubble-like chambers, which are the smallest units of the lungs. The heart pumps the clean oxygenated blood to the whole body. Throat and the esophagus delivers the food eaten to our digestive system. Throat is the intersectional joint passage of respiration and digestion channels.

Nose, airways and lungs are an integrated unit. Mouth, throat and digestion system form another unit. The most fundamental function of the nose is inhalation. If the air breathed through the nose is flowing freely within an adequate resistance, the final unit of our respiratory system, which is our lungs, will percieve that the air was iniatially breathed in through suitable passage and try the absorbe it. This happens automatically. If the mouth, which is substitute for the nose, is utilized for breathing instead

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DK Science: Respiratory System

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The respiratory system provides your body cells with the oxygen they need and rids them of carbon dioxide, a waste product. Playing a central part in this process are the lungs, two organs in the chest that work closely with the blood circulation. BREATHING is the cycle of moving air into and out of the lungs. Structures in the respiratory system are also vital to SPEECH.

Blood is carried from the heart to the lungs by the pulmonary arteries. They are the thick red vessels at the centre of this photograph of a resin cast of two lungs. The pulmonary arteries split into many branches, forming an intricate network of vessels that carry blood to the lungs’ alveoli. There, oxygen enters the blood, and carbon dioxide leaves it.

When air is breathed in, it passes down the trachea. This divides into two airways called main bronchi, which go to the two lungs. Each splits into smaller bronchi, which then split into bronchioles. These terminate in groups of tiny air sacs called alveoli.

Each lung contains millions of alveoli (air sacs), which

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History of respiratory mechanics prior to World War II

The history of respiratory mechanics is reviewed over a period of some 2,500 years from the ancient Greeks to World War II. A cardinal early figure was Galen (130-199 AD) who made remarkably perceptive statements on the diaphragm and the anatomy of the phrenic nerves. The polymath Leonardo da Vinci (1452-1519) contributed observations on pulmonary mechanics including the pleural space and bronchial airflow that still make good reading. Vesalius (1514-1564) produced magnificent illustrations of the lung, ribcage, and diaphragm. In the 17th century, the Oxford School including Boyle, Hooke, Lower, and Mayow were responsible for many contributions on mechanical functions including the intercostal muscles and the pleura. Hales (1677-1761) calculated the size and surface area of the alveoli, the time spent by the blood in the pulmonary capillaries, and intrathoracic pressures. Poiseuille (1799-1869) carried out classical studies of fluid mechanics including one of the first demonstrations of flow limitation in collapsible vesse