Fencing

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This document discusses the sport of fencing including the different weapons used (epee, foil, saber), required clothing and equipment for each weapon, fencing bases of attack and defense, competitions, and asks if the reader has any additional questions. It provides an overview of fencing with a focus on the various rules and requirements for the different types of fencing.

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It is a lipoprotein mixture present in thin layer of fluid lining the alveoli at the air fluid interface. COMPOSITION It is composed of Apoprotein Calcium ions Phospholipids i.e. dipalmitoyl lecithin Surfactant is secreted by 1. Mainly type II alveolar cells in the lungs. 2. Clara cells, which are situated in the bronchioles. It lowers the surface tension of fluid lining the alveoli. Surface tension is inversely proportional to surfactant concentration. During inspiration surfactant molecules move apart as lungs are expanded and during expiration surfactant molecules become concentrated as lungs shorten. When there is no surfactant, Surface Tension is 50 dynes/cm. when surfactant is present it is 5-30 dynes/cm depending upon the concentration Prevents collapse of lungs Stabilize size of alveoli Surfactant helps to keep lungs expanded. If there is deficiency of surfactant then the pressure of -20 to -30 mm of Hg will be required to keep the lungs expanded Surfactant also helps to keep the alveoli dry and prevent development of pulmonary edema. Surfactant is also helpful in lung expansion at birth. If there is deficiency then there is Respiratory Distress Syndrome. LAW OF LAPLACE: pressure required to keep a hollow viscous distended = 2 T/R Where T is tension and R is radius. During expiration, size of alveoli decreases so R is decreased and if T does not decrease, much higher pressure will be required to keep the alveoli distended. When adequate amount of surfactant is there T also decreases so increased pressure is not required. This prevents the collapse of lungs and also stabilizes the equal size of alveoli Definition: “Compliance is the measure of expansibility or distensibility of the lungs. It indicates with how much ease lungs can be expanded”. Work of Breathing In certain diseases there is increased work of breathing and depending upon the nature of breath there will be specific increase in work of breathing. In asthma there is increase in work of breathing to overcome airway resistance In restrictive lung diseases there is increase work of breathing in both tissue resistance and elastic recoil.

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