论文部分内容阅读
(一)肺部的气体交换: 肺的通气:系指肺泡和空气间的气体交换,呼吸运动是进行外呼吸的动力,肺本身不能自动伸缩。但它的弹性很大,可随着呼吸运动而伸缩。当肋间外肌、提肋肌与后锯肌收缩时,肋骨平举,胸廓张开,同时膈肌也收缩下降、胸腔负压增加(小于大气压2毫米汞柱)牵引肺泡膨大,空气流向低压的肺泡内,即平静吸气动作(主动性)。行深吸气时,胸锁乳突肌、斜方肌、斜角肌、大小胸肌等辅助肌也要参与工作。在平静吸气完了,肋间外肌和膈肌松弛,肋骨便可自然下垂,膈肌上升,胸腔
(A) the exchange of gas in the lungs: Ventilation of the lungs: refers to the exchange of gas between the alveoli and the air, respiratory exercise is the power to breathe out, the lungs can not automatically telescopic. But it is very flexible and stretches as it moves. When the intercostal muscles, the mention of the muscle and the retraction of the serratus muscle contraction, flat rib cage, chest open, while the diaphragm also decreased contraction, increased negative pressure in the chest (less than 2 mm Hg atmospheric pressure) traction alveolar expansion, the air flow to low pressure Alveolar, that is, calm inhaling action (initiative). Deep inspiratory line, sternocleidomastoid, trapezius, scalene, size of the pectoralis minor muscle also have to participate in the work. In the calm inhalation is over, the intercostal muscles and diaphragm relaxation, the ribs can be naturally drooping, diaphragm up, chest