呼吸系统unit5.ppt

The Respiratory System呼吸系统 Composition The respiratory system can be divided into two parts: The upper respiratory tracts: mouth, nose nasal cavity, pharynx and larynx The lower respiratory tracts: trachea, bronchi, bronchioles, alveoli, diaphragm and lungs Function Transports air into the lungs and facilitates the diffusion of oxygen into the blood stream. It also receives waste carbon dioxide from the blood and exhales it. Organs of the respiratory system Nose / mouth Nasal cavity Pharynx Epiglottis Larynx Trachea Bronchus (bronchi) Bronchioles Alveoli Pleura Diaphragm Lungs pharynx [f?r??ks] n.咽 larynx[l?r??ks]n 喉 flap [fl?p] n. 垂下物 epiglottis [,ep?gl?t?s] n. 会厌 windpipe [w?n(d)pa?p] n.气管 trachea [trek??] n. 气管 bronchus [br??k?s] n. ([复]bronchi) 支气管；小支气管 bronchiole [br??k???l] n.细支气管 alveolus [?lvi?l?s] n.([复]alveoli) 肺泡 lubricate[lu?br?ke?t]v. 润滑 pleura [pl??r?] n. 胸膜，肋膜 sternum[st??n?m]n. 胸骨 vertebra [v??t?br?] n.([复]vertebrae) n.椎骨 intercostal[,?nt?k?st(?)l]a. 肋骨间的 floating [fl??t??] a. 浮动的 diaphragm [da??fr?m] n.隔膜 superior vena cava 上腔静脉 inferior vena cava 下腔静脉 When you breathe, the air enters the body through the nose or the mouth travels down the throat ( pharynx) through the larynx (voice box) and trachea (windpipe) goes into the lungs through tubes called main-stem bronchi one main-stem bronchus leads to the right lung and one to the left lung in the lungs, the main-stem bronchi divide into smaller bronchi and then into even smaller tubes called bronchioles bronchioles end in tiny air sacs called alveoli The tube which carries the air from the mouth is called the trachea or windpipe, this later divides into two at which point it becomes the Bronchi and divides the air equally to each lung. Once the air enters the lungs it passes thro