新西兰生理学论文代写：肺癌

新西兰生理学论文代写：肺癌

导致癌症死亡的主要原因可归因于肺癌，后者比其他形式的肺癌更致命。吸烟是吸烟者和非吸烟者因二手烟暴露而导致肺癌的主要原因之一。暴露于致癌物质的空气中，由于污染或职业危害和暴露于氡是其他肺癌的致癌因素。
肺癌的发病率可以对由于使用烟草产品所产生的百分之九十例吸烟密切相关（ankathil，2010）。烟草中含有超过四千种化学物质，其中许多已被发现具有致癌致癌特性。亚硝胺和多环芳香烃是两类化合物已被发现是两大发现烟草中的致癌物质。戒烟会导致肺癌的发生，因为受损的细胞被新生长的正常细胞所取代，但随着吸烟时间的延长，每天的风险增加。被动吸烟是通过呼吸吸入烟草是导致非吸烟者肺癌发病的主要原因。有很多在nacirema吸烟人的生活可能已在岛上肺癌发病的主要原因。
氡是由铀、镭和钍在岩石中的正常衰变而释放出来的放射性气体。铀在大多数岩石（火成岩或火山成因的花岗岩）和自然水域中自然存在，在岛屿环境中普遍存在。看不见的，无味无臭的气体的特性使得它很难检测正常（Darby，Hill &娃娃，2011）。根据不同的地质条件，当氡溶解于地下水时，当水被使用时，氡被暴露在空气中。对于氡的影响，他们必须暴露在大量，因此通风不良的地区或绝缘良好的房子是非常容易接触到气体。气体迅速衰减并释放微小的放射性粒子，当吸入损害了细胞轮廓肺和长期暴露导致癌症。氡是肺癌的第二大原因。

新西兰生理学论文代写：肺癌

A leading cause of death due to cancers can be attributed to lung cancers which is more deadly than the other forms. Smoking is one of the main causes of lung cancers in smokers and in non-smokers due to exposure to second hand smoke – passive smoking. Exposure to carcinogens in the air due to pollutions or occupational hazards and exposure to Radon are other lung cancer causing factors.
Lung cancer incidence can be strongly correlated with smoking of cigarettes with about ninety percent of the cases arising as a result of use of tobacco products (Ankathil, 2010). There are over four thousand chemical compounds in tobacco, a lot of which have been found to possess cancer causing carcinogenic properties. Nitrosamines and polycyclic aromatic hydrocarbons are two such compounds which have been found to be the two major carcinogens found in tobacco. Smoking cessation causes a decrease in lung cancer occurrence as the damaged cells are replaced by newly growing normal cells but with prolonged smoking the risk increases every day. Passive smoking where tobacco is inhaled through breathing is a major cause for lung cancer incidence in non-smokers. The lifestyle of people with a lot of tobacco use in Nacirema could have been a major cause for lung cancer prevalence in the island.
Radon, a radioactive gas is released by the normal decay of Uranium, radium and thorium in rocks. Uranium occurs naturally in most rocks (igneous rocks or granites of volcanic origins) and natural waters which are prevalent in an island environment generously. The invisible, tasteless and odorless properties of the gas make it difficult to detect normally (Darby, Hill & Doll, 2011). Depending on the geology, the radon is exposed to humans when it dissolves in the ground water and when that water is used radon is released on to the air. For radon to have an effect they must be exposed in large amounts and hence poorly ventilated areas or well insulated houses are highly susceptible to exposure to the gas. The gas decays quickly and releases tiny radioactive particles which when inhaled damage the cells that outline the lungs and with long-term exposure causes cancer. Radon is the second largest cause for lung cancer.