论文部分内容阅读
人们在安静状态下,呼吸运动是由肋间外肌和膈肌的收缩和舒张引起的。本实验可以演示:膈肌的收缩和舒张引起膈膜的下降和上升,使胸廓的上下径增大和减小(即胸腔容积扩大和缩小),造成肺内气压的降低和升高,因而产生吸气和呼气的动作。取一支三通玻璃管,在其上端外径贴一根内径3毫米的塑料管(可用粗细相似的玻璃管代替),用橡皮膏把三通玻璃管上端和塑料管包上几圈,再把它插进大号(直径100毫米左右)玻璃漏斗的颈管内,插口涂上凡士林,防止漏气。接着,在三通玻璃管的下面二端各套上一个小气球(小朋友玩的橡皮气球)。然后,取一只乳胶(或橡皮)的手术手套,将套口套上漏斗体的
People in a quiet state, respiratory movement is caused by the intercostal muscle and diaphragmatic contraction and relaxation. This experiment can demonstrate: diaphragmatic contraction and diastole caused by the diaphragm down and up, so that the thoracic diameter increases and decreases (ie, pleural volume expansion and contraction), resulting in lower and increased intrapulmonary pressure, resulting in inhalation And breath movements. Take a three-way glass tube, in the upper end of the outer diameter of a plastic tube with a diameter of 3 mm (available similar thickness of the glass tube instead), with the adhesive tape to the upper end of the tee and the plastic tube wrapped a few times, and then Insert it into the neck of a large (about 100 mm in diameter) glass funnel with a Vaseline-coated socket to prevent air leaks. Next, put a small balloon (a rubber balloon for children to play) on the lower ends of the three-way glass tube. Then, take a latex (or rubber) surgical gloves, the cuff placed on the funnel